Refactoring todo list

[nickhsine]

Optimization

1. reuse common bundles, such as react, react-dom, draft-js, lodash, immutable, .etc, large bundles.
2. lazy load optional webpack bundles, such as draft-js(more than 150kb)
3. do not load unnecessary bundles（因為我們目前 bundles 產生是透過 packages/embed-code-generator，它的 main bundle 會有 feeback, qa-list 和 questionnaire 的程式碼，但使用者可能只需要 feedback 的 embed code ）
4. 把 bundles/chunks 上傳到我們的 CDN，而非透過 unpkg 來提供檔案；原因在於 unpkg 的網址包含 pkg version，不利於 CDN cache，只要我們一升版，網址改變，所有的 cache 都需要重來一遍。

Code Refactoring

• make all codes pass eslint and prettier
• add prettier, eslint commit hook
• extract packages/questionnaire/src/react-components/draft to be an pkg (readr-media/draft-editor) under packages/draft-editor

Infrustructure

• add CI to build and publish sub pkgs to npm registry, such as @readr-media/react-feedback if there are new commits in the repo.
• automatically upgrade @readr-media/react-embed-code-generator pkg if there is any sub pkg (@readr-media/react-feedback, @readr-media/react-qa-list, @readr-media/react-questionnaire) upgraded.
• automatically upgrade @readr-media/questionnaire and @readr-media/react-qa-list pkg if@readr-media/draft-editor is upgraded.

[nickhsine]

• reuse common bundles, such as react, react-dom, draft-js, lodash, immutable, .etc, large bundles.
• lazy load optional webpack bundles, such as draft-js(more than 150kb)
• do not load unnecessary bundles（因為我們目前 bundles 產生是透過 packages/embed-code-generator，它的 main bundle 會有 feeback, qa-list 和 questionnaire 的程式碼，但使用者可能只需要 feedback 的 embed code ）

PR #91 completes the above items.