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>

Makefile

@@ -0,0 +1,36 @@
+COMPOSE ?= docker compose
+
+# Compose does not support nested ${VAR:-${HOME}/...}; set defaults here (override in .env).
+-include .env
+export GOMODCACHE ?= $(HOME)/go/pkg/mod
+export GOCACHE ?= $(HOME)/.cache/go-build
+
+# One-off commands in the dev image (same caches and ./app mount as `make dev`)
+DEV_RUN := $(COMPOSE) run --rm --no-deps dev
+
+.PHONY: dev build up down generate tidy logs
+
+.DEFAULT_GOAL := dev
+
+dev:
+	@test -f .env || cp -n .env.example .env
+	$(COMPOSE) up --build dev
+
+build:
+	$(COMPOSE) build website
+
+up:
+	@test -f .env || cp -n .env.example .env
+	$(COMPOSE) up --build website
+
+down:
+	$(COMPOSE) down
+
+generate:
+	$(DEV_RUN) sh -c "templ generate"
+
+tidy:
+	$(DEV_RUN) go mod tidy
+
+logs:
+	$(COMPOSE) logs -f dev