docs: add GitHub Pages deployment guide

scripts/deploy.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+VERSION=$1
+
+if [ -z "$VERSION" ]; then
+  echo "Usage: ./scripts/deploy.sh v1.2.0"
+  exit 1
+fi
+
+echo "🔨 Building $VERSION..."
+bun run build
+
+echo "📦 Deploying to GitHub Pages..."
+cd dist
+git add .
+git commit -m "Deploy $VERSION" || echo "No changes to commit"
+git push
+
+cd ..
+echo "✅ Deployed to https://kccleoc.github.io/seedpgp-web-app/"
+echo "🏷️  Don't forget to tag: git tag $VERSION && git push --tags"