fix: hamburger menu, broken images, remove HN reference

- Hamburger menu visible on all screen sizes
- Fixed broken App Store badge images (replaced with styled buttons)
- Added emoji icons to use case and feature cards
- Removed Hacker News reference from social proof strip
- Fixed CSS class mismatches for ecosystem and privacy sections
- Redeployed to Cloudflare Pages

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: RedGridTactical

docs/index.html

@@ -149,8 +149,8 @@ <h1><span class="accent">Red Grid</span> Tactical</h1>
   <!-- SOCIAL PROOF STRIP -->
   <div class="proof-strip" aria-label="Social proof">
     <div class="container">
-      <span><strong>49 pts</strong> on Hacker News</span>
       <span><strong>iOS + Android</strong></span>
+      <span><strong>Zero</strong> Data Collection</span>
       <span><strong>986</strong> Tests Passing</span>
       <span><strong>AES-256</strong> Encrypted</span>
     </div>