This is an alternative PR to #13687.
Add `[ui.explore]` settings to allow restricting the
explore pages to logged in users only and to disable the users explore page.
The two proposed settings are:
- `REQUIRE_SIGNIN_VIEW`: Only allows access to the explore pages if the
user is signed in. Also restricts
- `/api/v1/user/search`
- `/api/v1/users/{username}`
- `/api/v1/users/{username}/repos`
- but does not restrict `/api/v1/users/{username}/heatmap`
- `DISABLE_USERS_PAGE`: Disables the /explore/users page
Fix#2908Close#13687
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>