cmd/pkgserver: guard sass/ts behind build tag

Packaging nodejs and ruby is an immense burden for the Rosa OS base system, and these files diff poorly.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/pkgserver/ui.go

@@ -1,13 +1,6 @@
 package main
 
-import (
-	"embed"
-	"net/http"
-)
-
-//go:generate sh -c "sass ui/static/dark.scss ui/static/dark.css && sass ui/static/light.scss ui/static/light.css && tsc -p ui/static"
-//go:embed ui/*
-var content embed.FS
+import "net/http"
 
 func serveWebUI(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")