plugins: remove vimeo plugins
Vimeo has been dropped in grilo-plugins due to the changes of the API. Also, even though we do the migration to the new API, vimeo has disabled their search function which was used by grilo-plugins.
see https://www.reddit.com/r/vimeo/comments/1gh1kc0/what_happend_to_vimeo/?rdt=63765