remove legacy resource fetch code

[adambreznicky]

original structure of app loaded all resources from the api on-load just like collections. this was changed to only retrieve resources from the api for a selected collection using the collection reducer & actions. somehow (probably from testing), the original fetching code is still in the app but just isn't used. this code should be removed.

at least exists in (may be more?):::

• CatalogContainer.jsx reference
• entire resourceActions.js file
• entire resourceReducer.js file
• rootReducer.js reference
• constants for the actions