Removed link to a member-restricted page

The link in the "Get Involved" page under code for viewing all issues only
works for members of the mauios organization on github. For non-members,
after being forced to log in, it will only show you issues for your own
repositories. I cannot find a suitable replacement without creating a
link to a very hacked together github search request, so I propose
complete removal of the link until a working alternative is found.