Refactor docs to be deployed as a static content

.github/workflows/docs.yml

@@ -10,7 +10,7 @@ jobs:
         with:
           submodules: "recursive"
       - name: Set up Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: 3.7
       - name: Install dependencies

tox.ini

@@ -48,13 +48,13 @@ commands =
     py.test -v --basetemp="{envtmpdir}" tests/test_examples.py
 
 [testenv:docs]
+; basepython = ~/.pyenv/versions/3.6.12/bin/python
 deps =
     sphinx
     sphinx_rtd_theme
     restructuredtext-lint
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees docs docs/_build/html
-    sphinx-build -W -b latex -d {envtmpdir}/doctrees docs docs/_build/latex
 
 [testenv:docslinkcheck]
 deps =