feat(webui): bootstrap session handling and login process

pkg/webui/cache.go

@@ -0,0 +1,10 @@
+package webui
+
+import "net/http"
+
+func cache(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+		next.ServeHTTP(w, r)
+	})
+}