Vaibhav Gupta

Add a note for webrick under "Testing your GitHub Pages site locally with Jekyll"

3

### Why: Closes #20562 ### What's being changed (if available, include any code snippets, screenshots, or gifs): 1. Add a note for the users to add `webrick` in their Gemfile...

Fix namespacing problem

13

Every function is now under `READTHEDOCS` object. Users have flexibility to override any of them. (Tested)