docs: add warning for outdated versions

.gitlab-ci.yml

@@ -58,7 +58,7 @@ variables:
   CI_AUTO_TEST_SCRIPT_REPO_BRANCH: "ci/v3.1"
 
   # Versioned esp-idf-doc env image to use for all document building jobs
-  ESP_IDF_DOC_ENV_IMAGE: "$CI_DOCKER_REGISTRY/esp-idf-doc-env:v9"
+  ESP_IDF_DOC_ENV_IMAGE: "$CI_DOCKER_REGISTRY/esp-idf-doc-env:v10"
 
 .setup_tools_unless_target_test: &setup_tools_unless_target_test |
   if [[ -n "$IDF_DONT_USE_MIRRORS" ]]; then

docs/requirements.txt

@@ -19,4 +19,4 @@ nwdiag==2.0.0
 recommonmark
 future>=0.16.0 # for ../tools/gen_esp_err_to_name.py
 sphinx_selective_exclude==1.0.3
-sphinx_idf_theme==0.2.2
+sphinx_idf_theme==0.3.0