Switch to relay-style pagination

[kdembler]

Since it seems relay-style pagination is superior to what we're currently using and also will be supported by GraphQL framework Hydra is using we should switch to it.

As part of this task, we should do the following:

• Rewrite app logic that handles fetched data
• Update Apollo Client's cache behaviour (this may be the most complex part)
• Update MirageJS logic:
  • Use the new pagination style
  • Return paginated data from the DB instead of just repeating the dataset

Reference:

• https://www.apollographql.com/docs/react/data/pagination/#relay-style-cursor-pagination
• https://relay.dev/graphql/connections.htm
• Allow option to conform to Relay spec goldcaddy77/warthog#338