fix(turbo): include notes/ as input to web build

The blog page reads notes/*.mdx at build time, but notes/ lives outside
apps/web so Turbo's default in-package hashing missed it. Adding new
posts to notes/ resulted in FULL TURBO cache hits that replayed the
stale build, leaving new posts invisible on the live blog.

Declare notes/** as an extra input for @data-peek/web#build so any
change under notes/ busts the cache and triggers a real rebuild.

turbo.json

@@ -24,6 +24,11 @@
         ".output/**"
       ]
     },
+    "@data-peek/web#build": {
+      "dependsOn": ["^build"],
+      "inputs": ["$TURBO_DEFAULT$", "../../notes/**"],
+      "outputs": [".next/**", "!.next/cache/**"]
+    },
     "build:mac": {
       "dependsOn": ["^build"],
       "outputs": ["dist/**", "out/**"],