feat: add website components and pages for LexAI

- Implemented SiteHeader and SiteFooter components for consistent navigation and footer across the website.
- Created CommunityPage and ContributePage to provide information on community involvement and contribution guidelines.
- Developed DocsPage to serve as the main documentation hub, detailing features and installation instructions.
- Added HomePage to introduce LexAI and its functionalities, highlighting key features and privacy aspects.
- Established links.ts for centralized management of external links used throughout the website.
- Configured main.tsx for application entry point with React Router for navigation.
- Introduced styles.css for consistent styling across the website.
- Set up TypeScript configuration files for improved type checking and development experience.
- Configured Vite for building and serving the website.

docs/design/website.md

@@ -0,0 +1,33 @@
+# Design spec — LexAI website
+
+## User + job
+
+Open-source visitors evaluating LexAI. Success: understand BYO-key privacy, pick Chrome / VS Code / CLI, reach install or docs in ≤ 2 clicks from the hero.
+
+## Flow
+
+Landing → Features → Packages → Docs (deep) or Chrome Web Store / Git. Secondary: Docs nav anchors per package.
+
+## Screens
+
+| Route | Purpose |
+| --- | --- |
+| `/` | Brand hero, feature highlights, package cards, privacy, CTAs |
+| `/docs` | All packages + features, install pointers, shared core |
+
+States: static marketing (no loading/error beyond 404 → home link).
+
+## Visual
+
+- Brand **LexAI** is the hero signal; bolt mark from product icon.
+- Atmosphere: deep slate field + amber bolt accent (from icon gold), not purple-on-white.
+- Type: Syne (display) + Source Sans 3 (body).
+- No card grid in hero; package cards only where choosing a product is the interaction.
+
+## Acceptance
+
+1. First viewport: LexAI brand, one headline, one support line, CTA group, dominant visual.
+2. Features of writing + Code Assist + Prompt Builder called out.
+3. Docs lists Chrome, VS Code, CLI with feature bullets and links to store/repo READMEs.
+4. Works desktop + mobile.
+5. `npm run website:build` succeeds.