mobile first UI improvements

[dpgraham4401]

Description

This PR makes a few changes to our UI to make the browser interface much more pleasant on mobile viewports, as well as some general refactoring/leaving the code in better place than we found it.

1. We remove the SiteTable and replace it with a SiteListGroup. Since we've removed the table (which inherently was more sort-able) we included a new filter feature to help a user find a specific fite.
2. We've removed some of the placeholder... garbage that was on the home page and replaced them with... well more placeholder garbage. But it's pretty placeholder garbage, a series of charts that mock what kind of information we could include on a user dashboard.
3. adjust the style of some of our UI components (e.g., do not include a bright blue header on all cards). I'm still not getting into a theme, but this is looking a little less bootstrap-y.
4. Cleaned up some things such as...
   • move more server queries to redux toolkit query
   • consolidate static assets into the public directory
   • remove unused components
   • fix layout of some components
   • move hard coded URLs to environment configs

Issue ticket number and link

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings