docs: use github pages instead of readthedocs

[smartcmd]

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[Cdm2883]

.github/workflows/gh-pages.yml

name: Publish docs via GitHub Pages

on:
  push:
    branches: [ "master" ]
    paths:
      - docs/**
      - mkdocs.yml

jobs:
  build:
    name: Deploy Docs
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v1

      - name: Deploy Docs
        uses: mhausenblas/mkdocs-deploy-gh-pages@master
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REQUIREMENTS: docs/requirements.txt

Try this 🥺 @smartcmd
You need to switch Settings -> Actions -> General -> Workflow permissions to Read and write permissions first.