* Add magic link email sign-in option
* Adding backend routes and model changes to keep state of email verification code and status
* Test and fix end to end email verification flow
* Add documentation for how to use the magic link sign-in when self-hosting Khoj
* Add magic link sign in to public conversation page
- Make the docs overview page available at docs.khoj.dev root instead of
under docs.khoj.dev/docs path
- Remove the new landing page, it is unnecessary.
- Remove /docs path prefix from links to internal doc pages
- Remove .md path suffix in internal doc pages for consistency