Disallow edits for JRubyConf EU too

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Hide the new proposal link

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Restrict routes to make proposals read-only

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Update copy for the end of CFP

Signed-off-by: Alex Coles <alex@alexbcoles.com>