- Updated logic to take url from referrer rather than pass as a query parameter.
- Added tests to cover functionality.
- Updated 404 page with login action button if not signed in.
- Updated 404 page with text to indicate permissions may be affecting visibility.
Related to #1817 and #1706
Deleted old static file.
Default output depends on app-public setting.
Otherwise can be overidden in `.env` file via `ALLOW_ROBOTS`
Otherwise view file can be customized.
Fixes#779