Configure a .readthedocs.yaml

And get rid of a disused travis config.

Author: jeff5

.readthedocs.yaml

@@ -0,0 +1,31 @@
+# .readthedocs.yaml
+
+# 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-22.04
+  tools:
+    python: "3.12"
+    # You can also specify other tool versions
+
+# Build documentation in the root directory with Sphinx
+sphinx:
+  configuration: ./conf.py
+
+# Optionally build additional formats such as PDF and ePub
+formats:
+  - htmlzip
+#   - pdf
+  - epub
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+  install:
+    - requirements: ./requirements.txt