Revert "ci: Delete all old CI files"

This reverts commit 35bffa5970.

.gitlab/merge_request_templates/MR.md

@@ -0,0 +1,8 @@
+
+<!-- Please describe your changes here -->
+
+-----------------------------------------------------------------------------
+
+- [ ] I ran `cargo fmt`, `cargo clippy`, and `cargo test`
+- [ ] I agree to release my code and all other changes of this MR under the Apache-2.0 license
+

.gitlab/route-map.yml

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+# Docs: Map markdown to html files
+- source: /docs/(.+)\.md/
+  public: '\1.html'