Add modal for guiding users once they've finished their project

[ndepaola]

Description

• I've seen several users report that they're (understandably) not quite sure what to do once they've finished building their order

• Adding a new modal for stepping users through the second phase of using the tool

• Looks a bit like this:
  

• Re-styled the right panel buttons so they look like this now:
  

Checklist

• I have installed pre-commit and installed the hooks with pre-commit install before creating any commits.
• I have updated any related tests for code I modified or added new tests where appropriate.
• I have manually tested my changes as follows:
  • see above screenshots
  • I tried clicking each of the release buttons and clicking the "download project as xml" button, they all worked how i expected
• I have updated any relevant documentation or created new documentation where appropriate.
  • not yet. i do need to improve our docs but don't have time/energy to work on that tonight