Updated copy to match terminology we're using

ref https://linear.app/ghost/issue/AP-646/update-terminology-on-search-page

- "Account" instead of "profile", "handle" instead of "username"

apps/admin-x-activitypub/src/components/Search.tsx

@@ -156,7 +156,7 @@ const Search: React.FC<SearchProps> = ({}) => {
                         className='mb-6 mr-12 flex h-10 w-full items-center rounded-lg border border-transparent bg-grey-100 px-[33px] py-1.5 transition-colors focus:border-green focus:bg-white focus:outline-2 dark:border-transparent dark:bg-grey-925 dark:text-white dark:placeholder:text-grey-800 dark:focus:border-green dark:focus:bg-grey-950 tablet:mr-0'
                         containerClassName='w-100'
                         inputRef={queryInputRef}
-                        placeholder='Enter a username...'
+                        placeholder='Enter a handle or account URL...'
                         title="Search"
                         type='text'
                         value={query}
@@ -183,7 +183,7 @@ const Search: React.FC<SearchProps> = ({}) => {
 
                 {showNoResults && (
                     <NoValueLabel icon='user'>
-                        No users matching this username
+                        No users matching this handle or account URL
                     </NoValueLabel>
                 )}