Add integration with GitLab

[eeriksp]

Currently Docsy has very good integration with GitHub including but not being limited to "edit this page" and "create child page" links.

Some of the features already work with GitLab as well, for instance editing an existing page or opening an issue. Some do not work, creating a child page for example.

Perhaps an easier solution would be to document the fact that some links also work with GitLab and just hide the other links which do not work if a GitLab repo is given.

I am not sure whether GitLab supports all the other types of links, hopefully it somehow does, but in a short run it would be nice to announce the things which are working already.

[haslersn]

I would like this!

[ZhengHe-MD]

Yes, even if it is not fully supported now, at least it can be put into documents?

[narrenfrei]

We have also our docs hosted on GitLab and can report:

• Edit the page works fine.
• Create child page the generated URL needs to get adopted a little bit, but it should work. I have to say, that I don't use it in my project (and haven't tested to define a template for the new pages).
  • Sidenote: Also on GitHub you can also create a child page, if the current page has is a "_index.md" and has it's own folder. If it's a "normal" page without a separate folder, you create a sibling page, not a child page -i think.
• Also for creating a documentation issue for the specific page the generated URL needs to get adopted, but it should work.
• The functionality to create a project issue I've already adopted for GitLab and it works fine.