create docs with github pages using material for mkdocs

.github/workflows/ci.yml

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+name: ci # (1)!
+on:
+  push:
+    branches:
+      - master # (2)!
+      - main
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+      - run: pip install mkdocs-material # (3)!
+      - run: mkdocs gh-deploy --force

docs/index.md

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+# PULP DSP
+
+The PULP DSP library implements functions for Digital Signal Processing (DSP) on [Parallel Ultra Low Power (PULP) platform](https://pulp-platform.org/).
+
+## Getting Started
+
+Please refer to `README.md`.
+
+## Documentation
+
+The documentation is built from the latest master and hosted at github pages: [https://pulp-platform.github.io/pulp-dsp](https://pulp-platform.github.io/pulp-dsp).
+
+## Licensing
+
+Snitch is being made available under permissive open source licenses. See the `README.md` for a more detailed break-down.

mkdocs.yml

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+site_name: PULP DSP
+theme:
+  name: material
+
+  icon:
+    repo: fontawesome/brands/github
+
+repo_url: https://github.com/pulp-platform/pulp-dsp
+repo_name: pulp-platform/pulp-dsp
+