prepare settings for readthedocs deployment

.readthedocs.yml

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+version: 2
+
+conda:
+    environment: environment_docs.yml

environment_docs.yaml

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+name: pypsa-eur
+channels:
+  - conda-forge
+  - bioconda
+dependencies:
+  - python
+  - pip
+
+  - pypsa>=0.14
+
+  # Dependencies of the workflow itself
+  - xlrd
+  - scikit-learn
+  - pycountry
+  - seaborn
+  - snakemake-minimal
+  - memory_profiler
+
+  # Second order dependencies which should really be deps of atlite
+  - xarray
+  - bottleneck
+  - toolz
+  - dask
+  - progressbar2
+
+  # Include ipython so that one does not inadvertently drop out of the conda
+  # environment by calling ipython
+  - ipython
+
+  # GIS dependencies have to come all from conda-forge
+  - conda-forge::cartopy
+  - conda-forge::fiona
+  - conda-forge::pyproj
+  - conda-forge::pyshp
+  - conda-forge::geopandas
+  - conda-forge::rasterio
+  - conda-forge::shapely
+  - conda-forge::libgdal
+
+  # The FRESNA/KIT stuff is not packaged for conda yet
+  - pip:
+    - .
+    - sphinx
+    - sphinx_rtd_theme
+    - vresutils>=0.2.5
+    - git+https://github.com/FRESNA/atlite.git#egg=atlite
+    - git+https://github.com/PyPSA/glaes.git#egg=glaes
+    - git+https://github.com/PyPSA/geokit.git#egg=geokit
+    #- git+https://github.com/FRESNA/powerplantmatching.git#egg=powerplantmatching