Fix default local settings

ECOM-4673

Fix documentation link.

Add developer documentation.

ECOM-3216

Remove broken 'prettify' button for catalog queries.

ECOM-4540

ECOM-4601

Typo fix

- Corrected tests for Drupal data loader exception handling
- Updated Course API data loader to handle exceptions

ECOM-4528

ECOM-4543

Logging data integrity errors for the Drupal data loader. These errors will no longer stop execution of the data loader, so valid data will continue to be written to the database.

ECOM-4528

Resolved language warnings

Handling MySQL warnings as exceptions

Defaulting to en-us when loading courses from Drupal with the en language. This resolves the proliferation of warnings we see when running the data loaders.

Truncation warnings should always be treated as exceptions to avoid future issues.

ECOM-4528

Add marketing_url to course runs.

ECOM-4265

Verifying SSL certificates for Elasticsearch

ECOM-4230

Testing Hound

Update acceptance tests to verify affiliate cookie domain.

ECOM-4329

The logic for creating viewers has been moved to the view. This allows us to correct the data passed to the serializer when the viewers field is set to a comma-delimited list (e.g. for Swagger).

 ECOM-4489

ECOM-4414

- Using localhost instead of 127.0.0.1 because, strangely, 127.0.01 no longer works on my machine.
- Removed useless ELASTICSEARCH_URL and ELASTICSEARCH_INDEX_NAME settings from base.py

The same permissions for the catalog endpoint are now enforced for the Affiliate Window endpoint.

ECOM-4481

- Management command now retrieves JWT access tokens
- Data loaders now properly initialize API clients with the correct authentication mechanism

 ECOM-4414