Edit link to gitlab ide

[chriswalg]

It would be great to have a edit link to gitlab ide

example link:
https://gitlab.com/-/ide/project/$projectName/$repoName/edit/master/-/docs/$fileName

[ehuss]

Closing, as I believe this is now implemented via #1506. The template would look something like:

# book.toml
[output.html]
edit-url-template = "https://gitlab.com/-/ide/project/username/project-name/edit/master/-/{path}"