Add .readthedocs.yaml to fix building the course (#141)

Our latest builds failed due to missing .readthedocs.yaml configuration
file.

Signed-off-by: Heitor Pascoal de Bittencourt <heitorpbittencourt@gmail.com>

Author: heitorPB

.readthedocs.yaml

@@ -0,0 +1,29 @@
+# Read the Docs configuration file for Sphinx projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-lts-latest
+  tools:
+    python: "3.12"
+  apt_packages:
+    - enchant-2
+    - python3-enchant
+    - hunspell
+    - hunspell-pt-br
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: source/conf.py
+  # Fail on all warnings to avoid broken references
+  fail_on_warning: true
+
+formats:
+  - pdf
+
+python:
+  install:
+    - requirements: requirements.txt