Create tech stack docs (techstack.yml and techstack.md)

techstack.md

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+<!--
+&lt;--- Readme.md Snippet without images Start ---&gt;
+## Tech Stack
+subho951m/openastronomy.github.io is built on the following main stack:
+
+- [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript) – Languages
+- [Ruby](https://www.ruby-lang.org) – Languages
+- [CircleCI](https://circleci.com/) – Continuous Integration
+
+Full tech stack [here](/techstack.md)
+
+&lt;--- Readme.md Snippet without images End ---&gt;
+
+&lt;--- Readme.md Snippet with images Start ---&gt;
+## Tech Stack
+subho951m/openastronomy.github.io is built on the following main stack:
+
+- <img width='25' height='25' src='https://img.stackshare.io/service/1209/javascript.jpeg' alt='JavaScript'/> [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript) – Languages
+- <img width='25' height='25' src='https://img.stackshare.io/service/989/ruby.png' alt='Ruby'/> [Ruby](https://www.ruby-lang.org) – Languages
+- <img width='25' height='25' src='https://img.stackshare.io/service/190/CvqrSSFs_400x400.jpg' alt='CircleCI'/> [CircleCI](https://circleci.com/) – Continuous Integration
+
+Full tech stack [here](/techstack.md)
+
+&lt;--- Readme.md Snippet with images End ---&gt;
+-->
+<div align="center">
+
+# Tech Stack File
+![](https://img.stackshare.io/repo.svg "repo") [subho951m/openastronomy.github.io](https://github.com/subho951m/openastronomy.github.io)![](https://img.stackshare.io/public_badge.svg "public")
+<br/><br/>
+|8<br/>Tools used|02/29/24 <br/>Report generated|
+|------|------|
+</div>
+
+## <img src='https://img.stackshare.io/languages.svg'/> Languages (3)
+<table><tr>
+  <td align='center'>
+  <img width='36' height='36' src='https://img.stackshare.io/service/6727/css.png' alt='CSS 3'>
+  <br>
+  <sub><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS3">CSS 3</a></sub>
+  <br>
+  <sub></sub>
+</td>
+
+<td align='center'>
+  <img width='36' height='36' src='https://img.stackshare.io/service/1209/javascript.jpeg' alt='JavaScript'>
+  <br>
+  <sub><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript">JavaScript</a></sub>
+  <br>
+  <sub></sub>
+</td>
+
+<td align='center'>
+  <img width='36' height='36' src='https://img.stackshare.io/service/989/ruby.png' alt='Ruby'>
+  <br>
+  <sub><a href="https://www.ruby-lang.org">Ruby</a></sub>
+  <br>
+  <sub></sub>
+</td>
+
+</tr>
+</table>
+
+## <img src='https://img.stackshare.io/devops.svg'/> DevOps (3)
+<table><tr>
+  <td align='center'>
+  <img width='36' height='36' src='https://img.stackshare.io/service/190/CvqrSSFs_400x400.jpg' alt='CircleCI'>
+  <br>
+  <sub><a href="https://circleci.com/">CircleCI</a></sub>
+  <br>
+  <sub></sub>
+</td>
+
+<td align='center'>
+  <img width='36' height='36' src='https://img.stackshare.io/service/1046/git.png' alt='Git'>
+  <br>
+  <sub><a href="http://git-scm.com/">Git</a></sub>
+  <br>
+  <sub></sub>
+</td>
+
+<td align='center'>
+  <img width='36' height='36' src='https://img.stackshare.io/service/12795/5jL6-BA5_400x400.jpeg' alt='RubyGems'>
+  <br>
+  <sub><a href="https://rubygems.org/">RubyGems</a></sub>
+  <br>
+  <sub></sub>
+</td>
+
+</tr>
+</table>
+
+
+## <img src='https://img.stackshare.io/group.svg' /> Open source packages (2)</h2>
+
+## <img width='24' height='24' src='https://img.stackshare.io/service/12795/5jL6-BA5_400x400.jpeg'/> RubyGems (2)
+
+|NAME|VERSION|LAST UPDATED|LAST UPDATED BY|LICENSE|VULNERABILITIES|
+|:------|:------|:------|:------|:------|:------|
+|[github-pages](https://rubygems.org/github-pages)|N/A|02/08/18|Erik Tollerud |MIT|N/A|
+|[html-proofer](https://rubygems.org/html-proofer)|N/A|01/05/19|David Pérez-Suárez |MIT|N/A|
+
+<br/>
+<div align='center'>
+
+Generated via [Stack File](https://github.com/marketplace/stack-file)

techstack.yml

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+repo_name: subho951m/openastronomy.github.io
+report_id: b01f29417e5f692dd871e734aacfe108
+version: 0.1
+repo_type: Public
+timestamp: '2024-02-29T19:10:48+00:00'
+requested_by: bsipocz
+provider: github
+branch: master
+detected_tools_count: 8
+tools:
+- name: CSS 3
+  description: The latest evolution of the Cascading Style Sheets language
+  website_url: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS3
+  open_source: true
+  hosted_saas: false
+  category: Languages & Frameworks
+  sub_category: Languages
+  image_url: https://img.stackshare.io/service/6727/css.png
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io
+  detection_source: Repo Metadata
+- name: JavaScript
+  description: Lightweight, interpreted, object-oriented language with first-class
+    functions
+  website_url: https://developer.mozilla.org/en-US/docs/Web/JavaScript
+  open_source: true
+  hosted_saas: false
+  category: Languages & Frameworks
+  sub_category: Languages
+  image_url: https://img.stackshare.io/service/1209/javascript.jpeg
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io
+  detection_source: Repo Metadata
+- name: Ruby
+  description: A dynamic, interpreted, open source programming language with a focus
+    on simplicity and productivity
+  website_url: https://www.ruby-lang.org
+  open_source: true
+  hosted_saas: false
+  category: Languages & Frameworks
+  sub_category: Languages
+  image_url: https://img.stackshare.io/service/989/ruby.png
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io
+  detection_source: Repo Metadata
+- name: CircleCI
+  description: Automate your development process quickly, safely, and at scale
+  website_url: https://circleci.com/
+  open_source: false
+  hosted_saas: true
+  category: Build, Test, Deploy
+  sub_category: Continuous Integration
+  image_url: https://img.stackshare.io/service/190/CvqrSSFs_400x400.jpg
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io/blob/master/.circleci/config.yml
+  detection_source: ".circleci/config.yml"
+  last_updated_by: David Pérez-Suárez
+  last_updated_on: 2020-03-12 18:06:36.000000000 Z
+- name: Git
+  description: Fast, scalable, distributed revision control system
+  website_url: http://git-scm.com/
+  open_source: true
+  hosted_saas: false
+  category: Build, Test, Deploy
+  sub_category: Version Control System
+  image_url: https://img.stackshare.io/service/1046/git.png
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io
+  detection_source: Repo Metadata
+- name: RubyGems
+  description: Easily download, install, and use ruby software packages on your system
+  website_url: https://rubygems.org/
+  open_source: false
+  hosted_saas: false
+  category: Build, Test, Deploy
+  sub_category: Package Managers
+  image_url: https://img.stackshare.io/service/12795/5jL6-BA5_400x400.jpeg
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io/blob/master/Gemfile
+  detection_source: Gemfile
+  last_updated_by: DavidPS
+  last_updated_on: 2015-02-18 18:14:24.000000000 Z
+- name: github-pages
+  description: Bootstrap the GitHub Pages Jekyll environment locally
+  package_url: https://rubygems.org/github-pages
+  license: MIT
+  open_source: true
+  hosted_saas: false
+  category: Libraries
+  sub_category: RubyGems Packages
+  image_url: https://img.stackshare.io/package/rubygems/image.png
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io/blob/master/Gemfile
+  detection_source: Gemfile
+  last_updated_by: Erik Tollerud
+  last_updated_on: 2018-02-08 20:52:15.000000000 Z
+- name: html-proofer
+  description: Test your rendered HTML files to make sure they're accurate
+  package_url: https://rubygems.org/html-proofer
+  license: MIT
+  open_source: true
+  hosted_saas: false
+  category: Libraries
+  sub_category: RubyGems Packages
+  image_url: https://img.stackshare.io/package/19495/default_8a79db3626c57c6bb46227c448ffd01861613398.png
+  detection_source_url: https://github.com/subho951m/openastronomy.github.io/blob/master/Gemfile
+  detection_source: Gemfile
+  last_updated_by: David Pérez-Suárez
+  last_updated_on: 2019-01-05 19:00:27.000000000 Z