Check for usage of API browser beautifier

[sveetch]

Is your feature request related to a problem? Please describe. Currently the API is browsable with included DRF API browser. It just works but it is not useful as something else like Swagger or Redoc.

Describe the solution you'd like drf-spectacular seems a good candidate to make OpenAPI schema and enable a more better browser like 'Swagger' or preferably 'Redoc'.

• https://github.com/tfranzel/drf-spectacular/
• https://github.com/tfranzel/drf-spectacular-sidecar (obligatory addon to avoid using CDN for browser assets);

If it works well, use it in demonstration and make a note about it in documentation.

[sveetch]

Tried in branch https://github.com/emencia/django-blog-lotus/tree/add_django_spectacular (started from v0.8.1-pre.2), it works well but it needs some adjustments.

At least it fails to determine the right type for fields using SerializerMethodField, there is some warning about it in console logs to help on solving them.

Once finished, it would just need a bit of documentation and cleaning configuration in sandbox.