mainpage redesign
update Gemfile
replace method from decorator to controller
Merge branch 'feature/fix_welcome_controller' into develop

* feature/fix_welcome_controller:
  replace method from decorator to controller
  update Gemfile
Merge branch 'release/v0.0.7'

* release/v0.0.7:
  replace method from decorator to controller
  update Gemfile
  mainpage redesign