Create a single overview page explaining git provider options to users

[mirnawong1]

Contributions

• I have read the contribution docs, and understand what's expected of me.

Link to the page on docs.getdbt.com requiring updates

https://docs.getdbt.com/docs/cloud/git/import-a-project-by-git-url#section-managing-deploy-keys
https://docs.getdbt.com/docs/cloud/git/git-configuration-in-dbt-cloud

What part(s) of the page would you like to see updated?

Feedback from product design (Michael Stein) on updating the configure git overview page:

We definitely need an update to the docs for repository connections.

This is specifically for the onboarding flow, so we need to have docs that are for connecting GitHub, GitLab, Managed, Git clone, and Azure DevOps. And it would be great if those were all in one doc, or at least centralized so we can use just one link.
https://docs.getdbt.com/docs/cloud/git/import-a-project-by-git-url#section-managing-deploy-keys
This is the current doc that we link to, but it's not very friendly for beginner users, and also doesn't mention Managed or Git clone and how those work.

we should definitely change it to link to that page. If we could add something about managed that would be great, and if it could say something about Git clone rather than "Import a project by git URL" I think that would ease some confusion for users, since that's how we talk about it in the product.

Additional information

No response