Remove Sphinx docs

[pavithraes]

Addresses #397

Description

This pull request:

• Removes the docs directory
• Removes readthedocs.yml and docs.yaml workflow
• Move the logo file in docs/_static to docusaurus-docs (all logo files will be added in a future PR)
• Misc updates to point to the right docs location
• Removed the markdown-block release checklist from the release process docs, and added a link to the issue template (the docusaurus/netlify build was failing with it.)

Pull request checklist

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

Additional information

❗️ Note - Point http://conda.store to the Netlify hosted docs before merging this PR (hence the blocked status)

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[pavithraes]

No longer blocked, can be reviewed and merged. :)