Migrate to Astro with shared components and GitHub Pages deploy

- Initialize Astro project with @astrojs/tailwind integration
- Shared components: BaseLayout, Navbar, Footer, PhoneMockup
- Real Tailwind CSS (not CDN): brand colors, Arcane Nine font, all styles shared
- All pages converted to .astro with proper component usage
- Static assets moved to public/
- GitHub Pages deploy workflow via withastro/action
- Add .gitignore (node_modules, dist, .astro)
- Old static HTML files removed

Author: VeldtJumper

.github/workflows/deploy.yml

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+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install, build, and upload
+        uses: withastro/action@v3
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

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+node_modules/
+dist/
+.astro/
+.env
+.env.*
+!.env.example

404.html

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+import { defineConfig } from 'astro/config';
+import tailwind from '@astrojs/tailwind';
+
+export default defineConfig({
+  site: 'https://commit451.com',
+  integrations: [tailwind()],
+  output: 'static',
+});