docs: Fixed readme badge for documentation

.github/workflows/doc-status.yml

@@ -0,0 +1,22 @@
+name: GH-Pages Status
+on:
+  page_build
+
+jobs:
+  see-page-build-payload:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+          architecture: x64
+      - name: check status
+        run: |
+          import os
+          status, errormsg = os.getenv('STATUS'), os.getenv('ERROR')
+          if status != 'built': raise AssertionError(f"There was an error building the page on GitHub pages.\n\nStatus: {status}\n\nError messsage: {errormsg}")
+        shell: python
+        env:
+          STATUS: ${{ github.event.build.status }}
+          ERROR: ${{ github.event.build.error.message }}

.github/workflows/docs.yml

@@ -1,38 +1,39 @@
-name: doc-deploy
+name: docs
 on:
   push:
     branches: main
 
 jobs:
-  docs-publish:
-    runs-on: ubuntu-latest
+  docs-deploy:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python: [3.8]
     steps:
       - uses: actions/checkout@v2
         with:
           persist-credentials: false
-      - name: Set up Python 3.8
+      - name: Set up Python
         uses: actions/setup-python@v1
         with:
-          python-version: 3.8
+          python-version: ${{ matrix.python }}
           architecture: x64
       - name: Cache python modules
         uses: actions/cache@v2
         with:
           path: ~/.cache/pip
-          key: ${{ runner.os }}-pkg-deps-${{ hashFiles('requirements.txt') }}-${{ hashFiles('**/*.py') }}
-          restore-keys: |
-            ${{ runner.os }}-pkg-deps-${{ hashFiles('requirements.txt') }}-
-            ${{ runner.os }}-pkg-deps-
-            ${{ runner.os }}-
+          key: ${{ runner.os }}-python-${{ matrix.python }}-${{ hashFiles('pyproject.toml') }}-docs
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -e .
-          pip install -r docs/requirements.txt
+          pip install -e ".[docs]"
 
       - name: Build documentation
-        run: |
-          sphinx-build docs/source docs/build -a -v
+        run: sphinx-build docs/source docs/build -a -v
+
+      - name: Documentation sanity check
+        run: test -e docs/build/index.html || exit
 
       - name: Install SSH Client 🔑
         uses: webfactory/ssh-agent@v0.4.1