Maintenance: Add ReadTheDocs configuration file.

Author: dvuckovic

.readthedocs.yaml

@@ -0,0 +1,24 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+version: 2
+
+build:
+  os: ubuntu-22.04
+  apt_packages:
+  - gettext
+  tools:
+    python: '3.11'
+
+sphinx:
+  configuration: conf.py
+  # TODO: Re-enable failure on warnings when all translation issues are handled.
+  # fail_on_warning: true
+
+formats:
+  - htmlzip
+  - epub
+
+python:
+  install:
+  - requirements: requirements.txt