Modifed .readthedocs.yaml (#6891)

* added mkdocs config file

* deleted .yml file

.readthedocs.yaml

@@ -17,5 +17,6 @@ mkdocs:
 # Optionally declare the Python requirements required to build your docs
 
 python:
+  version: 3.7
   install:
   - requirements: Docs/requirements.txt

.readthedocs.yml

@@ -1,14 +0,0 @@
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-version: 2
-
-mkdocs:
-  configuration: mkdocs.yml
-
-formats: all
-
-python:
-  version: 3.7
-  install:
-    - requirements: Docs/requirements.txt