Update repo to follow Gem development conventions

[JaredShay]

Adds a few quick updates from bundling the repo locally.

• Remove Gemfile from root directory
  • The root directory does not appear to need a Gemfile as it is not a library or app, and it doesn't seem like that will be the case in the future
• Add gemspec to the repository gem's Gemfiles.
  • This allows the gemspec files to specify the gem's dependencies which can be installed with bundle install by contributors. The docs for the method can be found here
• Add lock files to .gitignore
  • As the directories in this repo are gems, they will be targeting a range of versions, not a specific "locked" set of dependencies. By ignoring the lock files, the repo stays in a clean state after bundling, and the various gems can be developed against a range of dependency versions.

These conventions follow what is outlined in https://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/.

[nirga]

Thanks @JaredShay, I'm not sure I completely understood the rational behind this - mind explaining?

[JaredShay]

Thanks @JaredShay, I'm not sure I completely understood the rational behind this - mind explaining?

Yes, apologies. I pushed this up quickly while bundling the repo and never updated the description. The PR now has a description and reasoning behind each change.

[nirga]

Thanks so much for this! I'm a bit rusty on Ruby from my days at Fiverr 😅