Remove feedback widget.

@electron-elements/send-feedback won’t work with Electron 14, and all
it ever did was open your mail client.  Have the “Report an Issue”
menu item direct users to our website instead.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

typings.d.ts

@@ -3,22 +3,6 @@ declare namespace Electron {
   interface IncomingMessage extends NodeJS.ReadableStream {}
 }
 
-declare module "@electron-elements/send-feedback" {
-  class SendFeedback extends HTMLElement {
-    customStyles: string;
-    customStylesheet: string;
-    titleLabel: string;
-    titlePlaceholder: string;
-    textareaLabel: string;
-    textareaPlaceholder: string;
-    buttonLabel: string;
-    loaderSuccessText: string;
-    logs: string[];
-    useReporter: (reporter: string, data: Record<string, unknown>) => void;
-  }
-  export = SendFeedback;
-}
-
 interface ClipboardDecrypter {
   version: number;
   key: Uint8Array;