Minimal example of readthedocs configuration with conda

.readthedocs.yml

version: 2

conda:
    environment: docs/environment.yml

build:
   image: latest

# This part is necessary otherwise the project is not built
python:
   version: 3.7
   install:
      - method: pip
        path: .
        
# By default readthedocs does not checkout git submodules
submodules:                                                                                                                          
    include: all

environment.yml

name: readthedocs
dependencies:
  - python=3.7
  - astropy
  - numpy
  - cython
  - matplotlib
  - pytest
  - scipy