PWA: Make 1 call to the spreadsheet instead of scattered calls

Right now there are separate calls for the google spreadsheet. In order to make the app easier to migrate to a PWA, we need to make 1 or a few calls to the google spreadsheet instead of calls scattered around.

For example, the search page pulls the google sheet and the home page does as well. These can both share the google sheet state (which should be similar to a commander-style design pattern).

### Results

The google spreadsheet should be **a single source of truth**, or in other words, there should be **exclusively 1 place where the sheet state exists** and should only be pulled if necessary.