Revert "fix cfp submittion form plus some minor style hacks"

This reverts commit 99e4e989f4f8e7ce24ee5f7374de502493c16325.
Revert "add proposal show page"

This reverts commit 06fecc05ea57e4ba9b7e15a32ef3ae0a9e814b6a.
Revert "add first version of cfp submittion"

This reverts commit 27400e46e141e7166e69e77a036c2273db86c393.
update rails version