harden server, deduplicate CSS, fix layout and copy

- Parse templates once at startup instead of on every request

- Add security headers (X-Content-Type-Options, X-Frame-Options, etc.)

- Add per-request logging (IP, method, path, status, size, duration,

  referer, user-agent) — no PII in logs

- Add /healthz endpoint and graceful shutdown (SIGTERM)

- Validate waitlist emails and return proper errors on render failure

- Remove ~1700 lines of duplicate CSS appended to style.css

- Fix contribute grid (auto-fill → auto-fit for 3-card balance)

- Add accent color to contribute icons so SVGs are visible

- Center section headings, descriptions, waitlist form, and edition teaser

- Add Inter and JetBrains Mono Google Fonts

- Update hero and edition teaser copy to \"in development\"

- Add wget to Dockerfile for container healthcheck

- Point docker-compose healthcheck at /healthz

- Add .gitignore for build artifacts

Signed-off-by: Blake Ridgway <blake@blakeridgway.com>

docker-compose.yml

@@ -1,10 +1,3 @@
-# Arcline Project — Landing Page
-#
-# Deploy:    docker compose up -d
-# Stop:      docker compose down
-# Logs:      docker compose logs -f
-# Build:     docker compose build
-
 services:
   landing:
     build:
@@ -17,7 +10,7 @@ services:
     environment:
       - PORT=8080
     healthcheck:
-      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:8080"]
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:8080/healthz"]
       interval: 30s
       timeout: 3s
       retries: 3