Antoine/test new landing page

[frkralj]

Changelog

• Colors of dark/light theme
• Radical change of the sidebar menu, and navbar (with a split General / Developer)
• Change of the navbar logo's link (it points to the same thing as General)

Important notes

• I need help to:
  • Make this "/homepage" link as the homepage of the site (i.e. docs.mangrove.exchange to point to it)
  • Re-activate the sidebar on FAQ and Glossary pages, for some reason it doesn't show on those two
  • Make this "/contracts" link point to /developerss (i.e. docs.mangrove.exchange/developers) - I tried but it breaks all existing links in the docs, I'm hoping there's a way to do this without modifying everything by hand...
• Regarding the look of the doc, I only modified custom.css , sidebar.js , docusaurus.config.js. You might find some index.js file that was deleted and reinstated, because I thought I broke something so I grabbed it from another clean branch. I also changed a bit the doc folders (my doc stuff, not Developer-related) but that's minor.

[render]

Your Render PR Server URL is https://mangrove-docs-master-pr-193.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-ck9t3t5drqvc73bvsubg.