Add gem versions to Gemfile and update HTML

1. Updates to Gemfile

  This removes gems that to the best of my knowledge are not being used by the app. Also adds gem versions from from Gemfile.lock so that it is easier to upgrade minor (hopefully non-breaking) versions of gems in the future.

2. HTML Updates

+ Modifies whitespace
+ Update div layouts (adding and removing extras)
+ Fixes #8

There are no expected behavior changes and I've manually tested changes locally. Thus, I plan on merging into master; however, will leave the PR open for a few days for feedback. Let me know if you have any concerns or need more time.

Thanks!