RDoc-3598 Implement Edit on GitHub functionality

[mateuszbartosik]

https://issues.hibernatingrhinos.com/issue/RDoc-3598/Edit-on-GitHub-Implementation

[poissoncorp]

The user flow is incorrect.
https://issues.hibernatingrhinos.com/issue/RDoc-3449/Plan-Edit-on-GitHub-button-for-community-fixes#focus=Comments-67-1071423.0-0

He's redirected to language-specific (currently selected) page content on GitHub (edit mode)

Instead of redirecting to GitHub article .mdx page (view mode) we need to generate links to according language-specific files in edit mode (based on the selected language context)

e.g. https://github.com/ravendb/docs/edit/main/docs/client-api/_setting-up-authentication-and-authorization-csharp.mdx instead of https://github.com/ravendb/docs/blob/main/docs/client-api/setting-up-authentication-and-authorization.mdx

So if I'm viewing Python version of a doc, I'm redirected to edit that specific Python version.
If the document is language-agnostic, fallback to the default article page.

[kalczur]

@poissoncorp It should also point to the selected version, right?

[mateuszbartosik]

e.g. https://github.com/ravendb/docs/edit/main/docs/client-api/_setting-up-authentication-and-authorization-csharp.mdx instead of https://github.com/ravendb/docs/blob/main/docs/client-api/setting-up-authentication-and-authorization.mdx

That might be hard to achieve because we have inconsistency in language-specific content placement. Some of the files are placed inside an additional content directory, while the others are located directly in the parent.

It could probably be possible using a customized editUrl functionality, but that's beyond my reach. @kalczur what do you think?