Updating docs for v1.0.0b2

- Full cleanup of all the docs
- General sphinx housekeeping
- Updated all the old/bad links
- More reliable tests
- Updated Changelog
- Removed dead/deprecated code
- Added documentation generation test

.github/workflows/docs.yml

@@ -0,0 +1,24 @@
+name: Docs
+
+on: [push, pull_request]
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Build pycapnp and install
+      run: |
+        python setup.py build
+        pip install .
+    - name: Build documentation
+      run: |
+        sphinx-build docs build/html