index pdf download link

[hackartisan]

Summary or User Story

Some resources don't have a pdf download, so they should not present that as an option. This means we'll need to do some logic when we have the whole figgy resource, i.e. at index time

example record: 1dffc2e2-84ce-4775-93a4-d282d6bf2fc5

follow-up to #257 / #286

Acceptance Criteria

This section can be completed by the DLS team. Some requirements to consider
including:

• The UI implemented for this issue meets accessibility requirements
• New functionality is documented

First step

This section can be completed by the DLS team