CONFIGURED - Auto-activate git hooks via npm prepare script

Add a prepare script that runs 'git config core.hooksPath .githooks' on every
npm install, so the commit-msg style gate and pre-push test gate turn on
automatically per clone with nothing to remember. Guarded with '|| true' so
installs never fail where git is absent (e.g. tarball deploys). Document that
the deploy server never needs it since it only pulls.

package.json

@@ -3,6 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
+    "prepare": "git config core.hooksPath .githooks || true",
     "dev": "next dev -p 3014",
     "build": "next build --webpack",
     "start": "next start",