removes unused files that came from the starter kit
sets object titles
updates error page index template and adds show_in_navigation attribute to error page
cleanup

- single ticks
- no newline at the end of files
- indicate different parts of a method (setup/validation + code + return value)
adds deploy.yml to gitignore
uses fixed version for gems and uses more generic wording in generators
updates less-rails-bootstrap and simplifies assets