add tracking code

Signed-off-by: Alex Chi <iskyzh@gmail.com>

.github/workflows/main.yml

@@ -17,6 +17,8 @@ jobs:
         run: rustup show
       - uses: taiki-e/install-action@nextest
       - uses: taiki-e/install-action@mdbook
+      - name: patch for gh-pages build
+        run: mv mini-lsm-book/theme/head.hbs._ mini-lsm-book/theme/head.hbs
       - name: check and build
         run: cargo x ci
       - uses: actions/upload-pages-artifact@v1

mini-lsm-book/theme/head.hbs._

@@ -0,0 +1 @@
+<script defer src="https://eu.umami.is/script.js" data-website-id="e48af962-317d-483f-bc5d-663973169528"></script>