chore: sanitize template names and descriptions

- Renamed 'Artificial Intelligence' to 'Neural Network'
- Renamed 'Blockchain Protocol' to 'Secure Protocol'
- Renamed 'Crypto Futurism' to 'Digital Futurism'
- Renamed 'Startup SaaS' to 'Product Launch'
- Renamed 'Tech Startup' to 'Tech Venture'
- Removed references to AI, crypto, blockchain, and startups from template descriptions
- Updated README.md to remove specific startup/SaaS references

src-tauri/templates/tech/blockchain-protocol.json

@@ -1,8 +1,8 @@
 {
     "id": "blockchain-protocol",
-    "name": "Blockchain Protocol",
+    "name": "Secure Protocol",
     "category": "tech",
-    "description": "Technical blockchain and Web3 design. Decentralized aesthetics with protocol documentation style.",
+    "description": "Technical secure network design. Distributed systems aesthetics with protocol documentation style.",
     "vibe": "Technical, Decentralized, Protocol",
     "googleFontsImport": "https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Inter:wght@400;500;600&display=swap",
     "typography": {