docs readme has new hint on installing dependencies
To build and check the documentation:
-1. `cd docs/`
-2. `make html`
+
+1. `pip install docs/requirements.txt`
+2. `cd docs/`
+3. `make html`
When adding, removing or renaming a module, create / adapt a stub for autodoc.
Have a look at this RST cheatsheet: https://thomas-cokelaer.info/tutorials/sphinx/rest_syntax.html
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