Frontend scaffolding (prettier, navbar, testing)

[allisonking]

Some progress towards #676. Wanted to put in a PR before this got too big, since it was already touching a lot of files.

Code Changes

• Add import sorting similar to fidesops Import sorting via eslint fidesops#514
• Add baseUrl for easier imports
• Add prettier
• Run prettier
• Refactor Nav bar into a Layout component to make it easier to duplicate across pages
• Add testing to nav bar

Steps to Confirm

• Run npm run dev and poke around!

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation Updated:
  • documentation complete, or draft/outline provided (tag docs-team to complete/review on this branch)
  • documentation issue created (tag docs-team to complete issue separately)
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

Not really any big UI changes, but swapped out the fidesops navbar for one that looks more like the one in Balsamiq

Also added a page for /dataset but it's empty right now.

(that active state for "Datasets" in the nav bar probably isn't what we want it to look like, but I'm not gonna mess with CSS before we have an actual design)

After this, we should be ready to actually display some data on the /dataset route

[elliotbonneville]

This looks great, @allisonking. Love the cleanup work and improvements to tooling, etc. throughout. NavLink is also a well-implemented component. Thanks for cleaning that up.

Just one comment here around a use of any – if you can find away around using it I'm happy to approve!