Added requirements.txt for reproducible builds

Author: Sieuwkje-firely

.readthedocs.yaml

@@ -17,6 +17,6 @@ sphinx:
 
 # We recommend specifying your dependencies to enable reproducible builds:
 # https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
-#   install:
-#   - requirements: docs/requirements.txt
+python:
+  install:
+  - requirements: ./requirements.txt

requirements.txt

@@ -0,0 +1,8 @@
+pillow 
+mock==1.0.1 
+alabaster>=0.7,<0.8,!=0.7.5 
+commonmark==0.9.1 
+recommonmark==0.5.0 
+sphinx 
+sphinx-rtd-theme 
+readthedocs-sphinx-ext<2.3