web/projects: move projects to wiki

This allows users to add their own project to the list.

* Added link to wiki page on projects.html.
* Deleted projects link from menu

Signed-off-by: Lou Logan <lou@lrcd.com>
web/download: drop "Mac" from title

Since 2012 Apple no longer associates the "Mac" moniker with OS X.

Signed-off-by: Lou Logan <lou@lrcd.com>
web/style: Add a comment in the generated css file for the doc in the main repo