Fix broken build for docs

.pyup.yml

@@ -15,6 +15,7 @@ label_prs: update
 
 requirements:
   - "requirements.txt"
+  - "docs/requirements.txt"
   - "{{cookiecutter.project_slug}}/requirements/base.txt"
   - "{{cookiecutter.project_slug}}/requirements/local.txt"
   - "{{cookiecutter.project_slug}}/requirements/production.txt"

.readthedocs.yaml

@@ -0,0 +1,15 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# Version of Python and requirements required to build the docs
+python:
+  version: "3.8"
+  install:
+    - requirements: docs/requirements.txt

docs/requirements.txt

@@ -0,0 +1 @@
+sphinx==4.2.0