Caddy: Move to more templated approach

no ref

- The goal here is to be able to provide more functionality to self-hosters through snippets and other segmented config
- Some customers run Admin <-> content domains on separate ones which our current config doesn't support
- Our current config also hardcodes a www redirect which complicates setups when you don't have that domain setup or don't even want it
- Moving to a default template customers will have to copy which includes snippets allows us to update these later on without breaking peoples setups

caddy/Caddyfile.example

@@ -0,0 +1,38 @@
+# Replace your-domain.com with your actual domain
+{$DOMAIN} {
+	import snippets/Logging
+
+	# Traffic Analytics service
+	import snippets/TrafficAnalytics
+
+	# ActivityPub Service
+	import snippets/ActivityPub
+
+	# Default proxy everything else to Ghost
+	handle {
+		reverse_proxy ghost:2368
+	}
+
+	# Optional: Enable gzip compression
+	encode gzip
+
+	# Optional: Add security headers
+	header {
+		# Enable HSTS
+		Strict-Transport-Security max-age=31536000;
+		# Prevent embedding in frames
+		X-Frame-Options DENY
+		# Enable XSS protection
+		X-XSS-Protection "1; mode=block"
+		# Prevent MIME sniffing
+		X-Content-Type-Options nosniff
+		# Referrer policy
+		Referrer-Policy strict-origin-when-cross-origin
+	}
+}
+
+# Redirect www to non-www (optional)
+www.{$DOMAIN} {
+	import snippets/Logging
+	redir https://{$DOMAIN}{uri}
+}