Add mentioning for channels

reminder-dashboard/src/components/Reminder/Embed/Title.tsx

@@ -1,13 +1,14 @@
-import { useParams } from "wouter";
 import { useRef } from "preact/hooks";
-import { useMentions } from "../../App/useMentions";
+import { useGuild } from "../../App/useGuild";
+import { Mentions } from "../../App/Mentions";
 
 export const Title = ({ title, onInput }) => {
+    const guild = useGuild();
     const input = useRef(null);
-    useMentions(input);
 
     return (
         <>
+            {guild && <Mentions input={input} />}
             <label class="is-sr-only" for="embedTitle">
                 Embed Title
             </label>