docs: fix primary docs path

.gitlab-ci.yml

@@ -72,7 +72,7 @@ pages:
     - mkdir public
     - cd docs
     - make versionedhtml
-    - cp -r _build/$(git branch --sort=version:refname | tail -n1)/* _build/
+    - cp -r _build/$(git branch --sort=version:refname | tail -n1 | sed -e 's/..//')/* _build/
     - python redirects.py
     - cp -r _build/* ../public/
     - find ../public/