add readthedocs config files

.readthedocs.yaml

@@ -0,0 +1,29 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+    # You can also specify other tool versions:
+    # nodejs: "16"
+    # rust: "1.55"
+    # golang: "1.17"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: docs/conf.py
+
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+# formats:
+#    - pdf
+
+# Optionally declare the Python requirements required to build your docs
+python:
+   install:
+   - requirements: docs/requirements.txt

docs/conf.py

@@ -33,7 +33,6 @@ def __getattr__(cls,name):
 sys.path.insert(0, os.path.abspath('../tools/twutils/src/twutils/command_line'))
 sys.path.insert(0, os.path.abspath('../tools/twutils/src/twutils/QO'))
 sys.path.insert(0, os.path.abspath('../tools/twutils/src/twutils'))
-sys.path.append(os.path.abspath('./ext/breathe/'))
 
 read_the_docs_build = os.environ.get('READTHEDOCS', None) == 'True'
 if read_the_docs_build:

docs/requirements.txt

@@ -0,0 +1 @@
+breathe