[form submit errors] add Firebase callback

tell user it didn't work if there was an error.
[update home link] use /
[functionality check] add noscript messaging
[404] add 404 / fake 500 page
[erros] if no JS point form to 404
[form submit errors] add Firebase callback

tell user it didn't work if there was an error on submitting a "no"
[errors] if no JS point "no" form to 404
[build] compiled JS
remove duplicate div id's
[layout] put map and vcard into two columns
[content] add note about room block