Improvements & fixes to homepage repository display.

These changes mainly aim to prevent multiple concurrent requests from
deadlocking the table due to the lazy evaluation imposed by `objects.all()`,
and introduce some quality of life changes whilst doing so.

To prevent unwanted locks, the following is done:
- Instead of evaluating the first item of `objects.all()` only in order to
  determine when the table was most recently updated, we query for the least
  recent updated entry and use that instead. As we use `.first()`, the model
  instance is loaded directly.

The following quality of life changes are introduced:
- Instead of manual "update or create" logic for repositories retrieved from
  the API, use Django's `update_or_create` instead.
- Instead of manual bulk creation of entries on initial data retrieve, Django's
  `bulk_create` method is used instead.
- To allow for local testing of this endpoint without having to manually set up
  GitHub REST authorization, anonymous GitHub access is used when no
  `GITHUB_TOKEN` is configured.

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