Add local-development docs scaffold under root Documentation

Documentation/GettingStarted/LocalDevelopment/index.md

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+# Local Development
+
+Use this tutorial to run Lens locally and connect it to your Arc backend.
+
+## Prerequisites
+
+- Node.js 20 or later
+- npm
+- Chrome or another Chromium-based browser
+- A running Arc application on your machine
+
+## 1. Install dependencies
+
+From the repository root, install dependencies for the extension:
+
+```bash
+cd Source
+npm ci
+```
+
+You should see `added ... packages` with no install errors.
+
+## 2. Build the extension
+
+Build the extension bundle:
+
+```bash
+npm run build
+```
+
+This generates `Source/dist/`, including `manifest.json`.
+
+## 3. Load Lens in your browser
+
+1. Open `chrome://extensions`.
+2. Enable **Developer mode**.
+3. Select **Load unpacked**.
+4. Choose the `Source/dist` folder from this repository.
+
+The **Lens - Cratis Developer Tools** extension should now appear in your extension list.
+
+## 4. Set up Arc connection
+
+1. Open the extension options page from the extension details.
+2. Set **Arc Base URL** to your local Arc host, for example `http://localhost:5000`.
+3. Keep the default **Tenant Header Name** unless your app expects a different header.
+4. Select **Save Settings**.
+
+Lens can now fetch command and query introspection metadata from your Arc application.
+
+## 5. Use watch mode while developing
+
+Run this in `Source/` during active development:
+
+```bash
+npm run dev
+```
+
+Vite rebuilds the extension when you change source files. Reload the extension in `chrome://extensions` after each rebuild.
+

Documentation/GettingStarted/LocalDevelopment/toc.yml

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+- name: Local Development
+  href: index.md
+

Documentation/GettingStarted/index.md

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+# Getting Started
+
+Start here to run Lens locally and connect it to your Arc application.
+
+- [Local Development](LocalDevelopment/index.md)
+

Documentation/GettingStarted/toc.yml

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+- name: Getting Started
+  href: index.md
+  items:
+    - name: Local Development
+      href: LocalDevelopment/toc.yml
+

Documentation/index.md

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+# Lens Documentation
+
+This documentation helps you set up and use Lens during development.
+
+- [Getting Started](GettingStarted/index.md)
+

Documentation/toc.yml

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+- name: Lens Documentation
+  href: index.md
+  items:
+    - name: Getting Started
+      href: GettingStarted/toc.yml
+