[Docs] Clean up docs build

[aireilly]

SUMMARY:
This PR takes the fine work done in #1436 and cleans up some unused bits and pieces. Maybe we should merge #1436 first for clarity? 🤷

TODO:

• Set up mike in the CI (?)
• Is there a docs preview CI for PRs we can leverage?

For mike maybe:

# .github/workflows/deploy-docs.yml
name: Deploy versioned docs

on:
  push:
    branches:
      - main
    tags:
      - 'v*.*.*'

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:

      - uses: actions/checkout@v3

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'

      - name: Install dependencies
        run: cd docs && make install

      - name: Deploy docs
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          if [[ "${{ github.event_name }}" == "push" && "${{ github.ref_type }}" == "tag" ]]; then
            VERSION=${{ github.ref_name }}
            mike deploy "$VERSION" --push --update-aliases latest
          else
            mike deploy latest --push
          fi

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