Support Edit on GitHub / GitLab links

[mlncn]

In the sphinx_rtd_theme the following results in, with this configuration, an "Edit on GitLab" link will be shown at top right.

html_context = {
    "display_gitlab": True, # Integrate Gitlab
    "gitlab_user": "drutopia", # Organization
    "gitlab_repo": "documentation", # Repo name
    "gitlab_version": "master", # Version
    "conf_py_path": "/", # Path in the checkout to the docs root
}

Can alabaster support this also?

Maybe related: #165

[bostonrwalker]

+1 for this feature.

[lila]

+1 for this as well...