feat(Docs): prepare for sphinx-pages (#205)

* feat(Docs): prepare for sphinx-pages

* feat(CI): added sphinx workflow

* feat(Docs): added content

* fix(CI): use the patched GH action

* fix(CI): set source dir

* chore(Docs): reorder project structure

* chore(Docs): moved index.rst one level up?

* fix(Config): restore the config file, etc.

* fix(Docs): adjusted config

.github/workflows/sphinx.yml

@@ -0,0 +1,13 @@
+on: [push]
+
+jobs:
+  build:
+    name: Sphinx Pages
+    runs-on: ubuntu-latest
+    steps:
+      - uses: toniher/sphinx-pages@patch-1
+        id: sphinx-pages
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          create_readme: true
+          source_dir: docs