[sudo-sys] new form for omni key card requests

I'm sick of reminding people exactly how to request key cards. From now on let's just send people to this URL: https://omnicommons.org/keys/ It won't (and probably shouldn't) automatically add someone's card to the door computer. But it will send a formatted email to the keys list, which already exists for this purpose: https://omnicommons.org/lists/listinfo/keys The code is at /home/occupy/public_html/keys/index.php. It could use lots of love, such as: * somebody with front end skills to give it nice CSS * A writer to give it a nice intro text * A coder to make it better/safer/more automated