Move the new-filter form on the context page over to the left.
Hide panels if context is not active.
Furthermore, hide panels if context is yet unable to send.
Allow the user to delete pending confirmations.

...so that they can start over.

Fixes fedora-infra/fmn#20
Provide some more information to users about how to register their delivery details.
Merge pull request #28 from fedora-infra/feature/context-page-reorganization

Context page reorganization