[DOC] Template the image version with Sphinx config

Author: yansun1996

docs/conf.py

@@ -25,9 +25,13 @@
     "repository_url": "https://github.com/rocm/gpu-operator",
     # Add any additional theme options here
 }
-extensions = ["rocm_docs"]
+extensions = ["rocm_docs","sphinx_substitution_extensions"]
 
 # Table of contents
 external_toc_path = "./sphinx/_toc.yml"
 
 exclude_patterns = ['.venv']
+
+rst_prolog = """
+.. |version| replace:: v{version}
+""".format(version=version)

docs/installation/openshift-helm.md

@@ -1,2 +1,3 @@
 rocm-docs-core==1.18.1
-sphinx-reredirects
+sphinx-reredirects
+Sphinx-Substitution-Extensions==2025.6.6

docs/sphinx/requirements.in

@@ -277,4 +277,5 @@ wcwidth==0.2.13
 wrapt==1.17.0
     # via deprecated
 zipp==3.21.0
-    # via importlib-metadata
+    # via importlib-metadata
+Sphinx-Substitution-Extensions==2025.6.6