Add 'Edit this page' and 'Request documentation changes' links on every page of documentation

[dannylamb]

See the docker docs for an example. It's just links back to Github, but they're handy and might encourage contributions.

[rosiel]

It's done already by mkdocs! mkdocs/mkdocs#269

[rosiel]

They're defaulting to 'master', which isn't available anymore. I think there might be a way to configure the material theme to use a different branch...

[hannesdelbeke]

is there any documentation by mkdocs that explains how to do this?
found it: docs

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