Add Technical Kiwi website with Go, templ, and HTMX.

Single-page site with gallery by album and event, contact form over SMTP,
Docker dev/prod setup, and on-server image derivatives. Gallery photos stay
local (app/images/ is gitignored).

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yaml

@@ -0,0 +1,39 @@
+version: '3.9'
+
+services:
+  website:
+    image: technical.kiwi/website
+    container_name: technicalkiwi
+    build: ./
+    env_file:
+      - .env
+    #networks:
+    #  - caddy
+    labels:
+      caddy: technicalkiwi
+      caddy.reverse_proxy: "{{upstreams 8080}}"
+
+  dev:
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+    container_name: technicalkiwi-dev
+    ports:
+      - "7331:7331"   # templ live-reload proxy — open this in the browser
+      - "8080:8080"   # app direct (no auto-reload)
+    volumes:
+      - ./app:/app
+      - ${GOMODCACHE}:/go/pkg/mod
+      - ${GOCACHE}:/root/.cache/go-build
+    env_file:
+      - .env
+    environment:
+      ADDR: ":8080"
+      GOMODCACHE: /go/pkg/mod
+      GOCACHE: /root/.cache/go-build
+    working_dir: /app
+
+#networks:
+#  caddy:
+#    external: true
+#    name: caddy