Change icons in web UI (#27385)

Co-authored-by: Renaud Chaput <renchap@gmail.com>

app/javascript/mastodon/components/attachment_list.jsx

@@ -7,6 +7,8 @@ import classNames from 'classnames';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
+import { ReactComponent as LinkIcon } from '@material-symbols/svg-600/outlined/link.svg';
+
 import { Icon }  from 'mastodon/components/icon';
 
 const filename = url => url.split('/').pop().split('#')[0].split('?')[0];
@@ -25,7 +27,7 @@ export default class AttachmentList extends ImmutablePureComponent {
       <div className={classNames('attachment-list', { compact })}>
         {!compact && (
           <div className='attachment-list__icon'>
-            <Icon id='link' />
+            <Icon id='link' icon={LinkIcon} />
           </div>
         )}
 
@@ -36,7 +38,7 @@ export default class AttachmentList extends ImmutablePureComponent {
             return (
               <li key={attachment.get('id')}>
                 <a href={displayUrl} target='_blank' rel='noopener noreferrer'>
-                  {compact && <Icon id='link' />}
+                  {compact && <Icon id='link' icon={LinkIcon} />}
                   {compact && ' ' }
                   {displayUrl ? filename(displayUrl) : <FormattedMessage id='attachments_list.unprocessed' defaultMessage='(unprocessed)' />}
                 </a>