Revert "delete public/asset folder to deploy assets on heroku"

This reverts commit 4922037336c1bc3c16f6f6b073f2899bb74d960f.
Revert "add secret key to devise"

This reverts commit 8c2ea9a7c7bfb646ef4714191acd0d5bf630b9c5.
Revert "attempt to fix asset pipeline error to deploy heroku"

This reverts commit 43cbde2ffdeca5354caf5c65ad3c662acf24479a.
Revert "config.serve_static_assets se to true on production in attempt for heroku compile assets"

This reverts commit c415d79921d6384f2501034d6b262201e9cb7477.