search-bar: Hide contact button

The contact button is intentionally hidden until the page is fully implemented.

Gitlab: #232

Change-Id: Icd9503734f74d24bc0b0683ca9e41bb95a994ba3

client/src/components/ContactSearchBar.tsx

@@ -64,6 +64,7 @@ export default function ContactSearchBar({ placeholder, handleChange }: ContactS
           }}
         />
         <SquareButton
+          sx={/* FIXME: Hide button until the contact page is available */ { visibility: 'hidden' }}
           aria-label="start swarm"
           Icon={PeopleGroupIcon}
           onClick={() => {