docs: Replace docs/ with symlinks

[Luc-Mcgrady]

Linked issue (required)

closes #5001

This PR replaces the contents of docs/ with symlinks to docs-site/developers/

A caveat of this is that the metadata appears at the top of the file instead of the title.

We could either:

• Use ninja to copy the files from docs-site/developers and convert it from .mdx to .md (Might be a problem with the symlink approach if mdx is added to the contributor file later)
• Leave placeholder "For contribution instructions see: (link to mintlify site)"s in the folder, which would have to wait until the domain of the site is set. (Probably the best solution).

[abdnh]

Leave placeholder "For contribution instructions see: (link to mintlify site)"s in the folder

Let's link to https://anki.mintlify.app/ for now?

We have a couple of .md links in README files. What about removing the symlinks and keeping just docs/contributing.md and docs/development.md around with links to the Mintlify website?