Add module editing on mobile

Module editing should be possible from mobile, excluding releases of course. The first idea about how to implement this would be an edit button on the module page itself. When pressed, all of the editable parts of the page (image, description, and tags) would become input fields, allowing the user to change them. Where ever the edit button is initially placed, a "Done" and "Cancel" button should take it's place while editing.

Start at the module page and trace how its image, description, tags, and release information are displayed and edited. Add a mobile edit flow with an Edit button, editable image, description, and tags, plus Done and Cancel controls; releases must remain excluded.

Written by the indexing model from the issue text.