Beautify docs site

[umamukkara]

JavaScpript and CSS tunings are required for this docs site as well.

Some references to be considered:

• docs.mayaonline.io (for font and branding)
• Node blocks need to look like those at https://docusaurus.io/docs/en/navigation
• Content need to be stretched in the page
• Need edit functionality

[umamukkara]

@visualapps , I see some changes have been merged. Are you planning to add further changes?

Adding @inyee786 as well.