Use direct zapping for the donate page, link to flotilla space for support

src/app/components/Zap.svelte

@@ -26,7 +26,7 @@
   import {pushToast} from "@app/toast"
 
   type Props = {
-    url: string
+    url?: string
     pubkey: string
     eventId?: string
   }

src/app/components/ZapInvoice.svelte

@@ -30,7 +30,7 @@
   import {clip, pushToast} from "@app/toast"
 
   type Props = {
-    url: string
+    url?: string
     pubkey: string
     eventId?: string
   }