docs: fix dev mode (#1343)

docs in dev mode failed to start before, adding CJS-only `sanitize-url`
to the optimized deps should fix this.

Co-authored-by: MK (fengmk2) <fengmk2@gmail.com>

Author: TheAlexLichter

docs/.vitepress/config.mts

@@ -109,6 +109,9 @@ export default extendConfig(
         ],
       ],
       vite: {
+        optimizeDeps: {
+          include: ['mermaid > @braintree/sanitize-url'],
+        },
         resolve: {
           tsconfigPaths: true,
           alias: [