feat: add basic website

Signed-off-by: kjuulh <contact@kjuulh.io>

specs/features/001-landing-page.md

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+# Spec 001: Landing Page and Marketing Site
+
+## Status: Phase 2 (Implementation)
+
+## Behavioral Contract
+
+### Routes
+- `GET /` returns the landing page with HTTP 200
+- `GET /pricing` returns the pricing page with HTTP 200
+- `GET /static/*` serves static files from the `static/` directory
+- All pages use the shared base template layout
+- Unknown routes return HTTP 404
+
+### Landing Page Content
+- Hero section with tagline and CTA buttons
+- Code example showing a forest.cue manifest
+- Feature grid highlighting: registry, deployments, managed services, type safety, teams, pricing
+- Final CTA section
+
+### Pricing Page Content
+- Displays 4 tiers: Free ($0), Developer ($10/mo), Team ($25/user/mo), Enterprise (Custom)
+- Usage-based add-on pricing table
+- Accurate pricing data matching specs/PITCH.md
+
+### Non-Functional Requirements
+- Pages render server-side (no client-side JS required for content)
+- Response time < 10ms for template rendering
+- Valid HTML5 output
+- Responsive layout (mobile + desktop)
+
+## Edge Cases
+- Template file missing -> 500 with error logged
+- Static file not found -> 404
+- Malformed path -> handled by axum routing (no panic)
+
+## Purity Boundary
+- Template rendering is effectful (file I/O) -> lives in forage-server
+- No pure core logic needed for static pages
+- Template engine initialized once at startup
+
+## Verification
+- Integration test: GET / returns 200 with expected content
+- Integration test: GET /pricing returns 200 with expected content
+- Integration test: GET /nonexistent returns 404
+- Compile check: `cargo check` passes