Support filtering of resources

[vontell]

Currently, how the frontend works in terms of loading and filtering data is:

• Make a Firebase API call to get all of the resources
• In the frontend, we have a filter for the resource type
• Markers are loaded into the map

There are two pieces that need to be fixed:

1. Need to reimplement the filtering logic in this file (we can then remove the other selector files)
2. (optional) It would be nice to stream in or filter/query the firebase DB for certain fields rather than loading all resources at once.

Expected behavior: the filters in the desktop mode work