feat: add working compute environments listing

[bodom0015]

Problem

A view listing out the available Compute Environments was mocked up, but never implemented

Approach

Bring this view to life by connecting it with the API.

• Read-only for now, unless we want more
  • NOTE: I have skipped the Dropdown options from the mockup, as they proved to be more complicated than I initially thought. If we want this feature, I can give it another go

How to Test

1. Checkout this branch locally, rebuild the dashboard
2. Login to the WholeTale Dashboard
   • You should see a new link in the navbar that links to the Compute Environments
3. Click the Compute Environments nav
   • You should be brought to the new /environments view
   • You should see a list (accordion) of all available Images that have been created in WholeTale
4. Click on an image in the list
   • You should see the accordion expand to show more information about the chosen Image