Add speedups

.gitlab-ci.yml

 .pages: &pages
   image: monachus/hugo
   variables:
-    GIT_SUBMODULE_STRATEGY: recursive
+    GIT_SUBMODULE_STRATEGY: none
+    GIT_DEPTH: 1
+    GIT_CLONE_PATH: /cache
   script:
      - git status
      - rm -rf content