- Add: link to the wordpress.org support page in the plugin main page

git-svn-id: https://plugins.svn.wordpress.org/footnotes/trunk@919373 b8457f37-d9ea-0310-8a92-e5e31aec5664
- Update: Changed plugin URL from GitHub to WordPress

git-svn-id: https://plugins.svn.wordpress.org/footnotes/trunk@919375 b8457f37-d9ea-0310-8a92-e5e31aec5664