"Edit this Page" should link to the actual source of feature page

[gvenzl]

The "Edit this Page" button does not link the user back to the feature page source but rather the generated page, e.g:

[aalmiray]

Looks like providing this behavior requires building a custom Antora extension based on the structure we have to keep 1 original copy of a given feature page, and multiple "copies" that include the feature page. https://antora.zulipchat.com/#narrow/stream/282400-users/topic/Customize.20edit_url

[aalmiray]

Editing index pages for categories & versions yet to be done.