docs: Fix errant link, add prek hook to require compilable docs

.pre-commit-config.yaml

@@ -57,3 +57,15 @@ repos:
         types: [rust]
         stages:
           - pre-push
+
+  - repo: local
+    hooks:
+      - id: docs-build
+        name: docs build
+        entry: npm run docs:build
+        language: system
+        pass_filenames: false
+        files: docs/
+        types: [mdx]
+        stages:
+          - pre-commit