Fix for readthedocs publishing

Also updated docs generation code caused by
deprecated properties in recent version of Sphinx.

Change-Id: If3892cde658bb9d92b4b465f8ec4b1b210fc0ec0

.readthedocs.yaml

@@ -0,0 +1,28 @@
+# .readthedocs.yml
+# 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 doc/ directory with Sphinx
+sphinx:
+  configuration: doc/source/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats:
+  - pdf
+
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.10"
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  install:
+    - requirements: doc/requirements.txt

doc/requirements.txt

@@ -1,2 +1,2 @@
-sphinx>=1.6.2
-sphinx_rtd_theme>=0.4.3
+sphinx
+sphinx_rtd_theme

doc/source/conf.py

@@ -19,7 +19,7 @@
 # import os
 # import sys
 # sys.path.insert(0, os.path.abspath('.'))
-import sphinx_rtd_theme
+# import sphinx_rtd_theme
 
 
 # -- General configuration ------------------------------------------------
@@ -89,9 +89,8 @@ todo_include_todos = False
 #
 html_logo = '_static/airship.logo.white.svg'
 html_theme = "sphinx_rtd_theme"
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
 html_theme_options = {
-    'display_version': False,
     'logo_only': True
 }
 html_show_sourcelink = False