(docs) : only trigger netlify build for docs changes

docs/netlify.toml

@@ -6,6 +6,7 @@
   # and passes it as an env var to Hugo (used by the latest_version shortcode).
   command = "npm ci && RELEASE=$(grep '^tag:' ../RELEASE | awk '{print $2}') hugo --gc --minify"
   publish = "public"
+  ignore = "git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF -- ."
 
 [build.environment]
   HUGO_VERSION = "0.148.2"