refactor: remove pre-rendering complexity (Puppeteer, serve-handler)

- Remove puppeteer and serve-handler from devDependencies
- Delete scripts/prerender.js
- Remove build:prerender script from package.json
- Remove pre-rendering section from README.md
- Remove PUPPETEER_SKIP_DOWNLOAD from CI workflow

Rationale: Over-engineered solution. Modern search engines execute
JavaScript and index React apps. SEO meta tags are sufficient.

Author: raifdmueller

.github/workflows/deploy.yml

@@ -29,8 +29,6 @@ jobs:
 
       - name: Install dependencies
         run: npm ci
-        env:
-          PUPPETEER_SKIP_DOWNLOAD: true
 
       - name: Detect base path
         id: base

.playwright-mcp/element-2026-02-11T20-09-17-631Z.png

@@ -21,20 +21,6 @@ npm run build        # Production build
 npm run preview      # Preview build locally
 ```
 
-## Pre-rendering for SEO
-
-The app includes a Puppeteer-based pre-rendering script for better SEO.
-
-**Local pre-rendering (before release):**
-
-```bash
-npm run build:prerender
-```
-
-This renders the full React app to static HTML in `dist/index.html`.
-
-**Note:** Pre-rendering is not run in CI due to Puppeteer/Chrome setup complexity. The deployed version is a standard SPA (search engines with JS support will still index it, just slower).
-
 ## Documentation
 
 - Full docs: `npm run docs` → `dist/docs/`