flesh out docs a little

docs/contributing.md

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+We are very open to contributions!

docs/hosting.md

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+Documentation of the `master` branch is deployed to Netlify automatically.
+
+To host or develop locally:
+
+- install python3 and pip
+- `pip install mkdocs mkdocs-material`
+- `mkdocs serve` and visit [localhost:8000](http://localhost:8000).
+
+The file `runtime.txt` is necessary to tell Netlify to use Python3.

docs/index.md

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-../README.md

docs/index.md

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+Welcome to the technical documentation for [solokeyssec/solo](https://github.com/solokeyssec/solo).
+
+For now, you can read the repository `README.md`, more documentation to come!
+

docs/repo-readme.md

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+../README.md