Fix items path -- it takes too long to load

[eebbesen]

Instructions to recreate

1. Navigate to https://minutes-maid.herokuapp.com/
2. Click Items
3. Note the long load time and/or timeout

Details

Jan 27 22:23:36 
minutes-maid heroku/router: at=error 
code=H12 
desc="Request timeout" 
method=GET 
path="/items" 
host=minutes-maid.herokuapp.com 
...
service=30001ms 
status=503 
...
protocol=https

Per https://blog.papertrailapp.com/analyzing-heroku-router-logs-with-papertrail/

Code that requires more than 30 seconds must run asynchronously (e.g., as a background job) in Heroku. For more info read Request Timeout in the Heroku DevCenter.

Some Options

• limit number of records returned initially (currently returns all items, which could be a bit much)
• force user to choose filter on items path
• figure out if there's a better way to be performant (like pagination with lazy load)

I'm sure there are more options, too. And several of them are not mutually exclusive.