breaking: Catalog & Collection Endpoint + items link

[wphyojpl]

Closes #331
Closes #332

[wphyojpl]

catalog.json
collection.json
feature.collection.json

sample results from updated logic, but replaced URLs with local URL for testing.

[wphyojpl]

There is no pagination link at this moment as limit = 50 pagination comes from Cumulus.
In the new logic, it is not hitting Cumulus till every collection is queried.
Only UDS Elasticsearch which has code to query all collections.

Of course, there is a chance it will break down when there are 100k or more collections.
But I'm not sure if we should add pagination at this moment.

@ngachung FYI.