Create temp REST API reference

[pavithraes]

Addresses #754

Description

This pull request:

• adds openapi.json
• creates a static html file that generates the REST API using Swagger UI & openapi.json
• Invokes the html file as an iframe in the docusaurus page

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

Additional information

How to test

REST API Ref page preview: https://deploy-preview-766--kaleidoscopic-dango-0cf31d.netlify.app/conda-store/references/api
Static page preview: https://deploy-preview-766--kaleidoscopic-dango-0cf31d.netlify.app/rest-api.html

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[dcmcand]

Hey @pavithraes, how is this page generated? Does it need to be generated manually when API changes are made? If it isn't somehow automatic can we document how to generate it so that we know?

[pavithraes]

@dcmcand - Thanks for reviewing. The API docs are generated from openapi.json - I've opened #782 to auto-update the json file after each release. I think #782 unblocks us from merging this PR. :)