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>

.env.example

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+# SMTP relay for the contact form (all three required to enable the form)
+SMTP_HOST=smtp.example.com
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASSWORD=
+SMTP_FROM=website@technical.kiwi
+SMTP_TO=hello@technical.kiwi
+
+# TLS mode: auto (STARTTLS on 587), tls (465), plain (25/local relay)
+SMTP_TLS=auto
+
+# HTTP listen address
+ADDR=:8080
+
+# Homepage hero (path under app/images/)
+HERO_IMAGE=connectionmachine/20220723_231556.jpg
+
+# Host Go caches mounted into the dev container (make sets ~/go/pkg/mod and ~/.cache/go-build if unset)
+# GOMODCACHE=/home/you/go/pkg/mod
+# GOCACHE=/home/you/.cache/go-build