Add pagination ability

[gmrabian]

Summary

Built pagination option per accessibility guidance and to speed up initial app load.
Loads 20 colleges and has a "Load more" button to get 20 at a time.
Filtering works with entire dataset. When you remove filtering it goes back to pagination.

• Updated details and confirmation pages to pull college from context object
• Update tests

Fixes #195

Type of change

• New feature (non-breaking change which adds functionality)

How To Test

• Browse page loads faster
• "Load more" loads 20 more colleges at a time
• Filtering works with full college dataset
• Removing filters goes back to paginated set

Checklist:

• My code follows the style guidelines of this project and has no linting errors
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation, including any applicable ADRs
• My changes generate no new warnings
• I have added tests that fail without these changes
• New and existing tests (unit, integration, accessibility) pass locally
• Documentation updated
• If there are security concerns they are addressed or ticketed after being discussed

[codeclimate]

Code Climate has analyzed commit b3ea0fd and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

The test coverage on the diff in this pull request is 76.2% (80% is the threshold).

This pull request will bring the total coverage in the repository to 86.7%.

View more on Code Climate.