feat: upgrade website to new angular scaffolding

[ProgrammingByPermutation]

Many of the features of angular upgraded properly with automated upgrades but they didn't exactly move us to the "new stuff."

For example:

• New angular deployments use vitest instead of karma
  • The upgrade left us on karma without mention of the vitest
• The upgrade mentioned it failed to move to the new build system
  • This may have been erroneous. The angular.json matched in the important ways for the build
  • The manual upgrade documentation doesn't match the output of a fresh angular project creation (e.g. folder names)
• New angular deployments use public instead of assets
  • No change when upgrading

I'm sure a whole bunch of other things I don't even know about.

It may be worthwile, since the site has so little content, to create a brand new project with the angular cli and port the pages we actually use over.