Implement pagination on the /resources page

[lpatmo]

Context

At the moment, we're returning all resources on the /resources page.

When we make a GET request to /resources, the response looks something like:

{
    "count": 46,
    "next": "http://localhost:8000/api/v1/resources/?page=2",
    "previous": null,
    "results": [
        {
            "guid": "4e85dbb6-d519-11ea-a622-0242ac130002",
            "author": "",
            "title": "asldfkjadsf",
            "description": "",

Acceptance criteria

[ ] Implement pagination -- the user should be able to click on "next" or "previous" to go to the next or previous pages.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[pdotsani]

Will start once #147 is merged.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.