Set different default branch for mkdocs edit

[zoispag]

From mkdocs documentation:

Note

On a few known hosts (specifically GitHub, Bitbucket and GitLab), the edit_uri is derived from the 'repo_url' and does not need to be set manually. Simply defining a repo_url will automatically populate the edit_uri configs setting.

For example, for a GitHub- or GitLab-hosted repository, the edit_uri would be automatically set as edit/master/docs/ (Note the edit path and master branch).

For a Bitbucket-hosted repository, the equivalent edit_uri would be automatically set as src/default/docs/ (note the src path and default branch).

To use a different URI than the default (for example a different branch), simply set the edit_uri to your desired string. If you do not want any "edit URL link" displayed on your pages, then set edit_uri to an empty string to disable the automatic setting.

Hopefully closes #845

[codecov]

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