Fix 404 widget script URL

Fix 404 widget script URL to be compatible with HTTPS by replacing
`http://` with `//`. The script hosted by Google is available on both
protocols.
Update CHANGELOG
Merge remote-tracking branch 'upstream/master'
Import latest `.htaccess` configurations

Update the Apache configurations to include the
latest changes in the canonical `.htaccess` file.
Merge remote-tracking branch 'upstream/master'