Twenty Twenty One: Remove Skiplink shim for Internet Explorer.

No version of Internet Explorer is still supported by WordPress or Microsoft. Usage of Internet Explorer has dropped to about 0.1%.

Follow up to [61628] to also remove JS that fixed skip link behavior for IE. Also remove overlooked contents of `ie-editor.css.map`.

Props sabernhardt, westonruter, joedolson.
Fixes #64590.

git-svn-id: https://develop.svn.wordpress.org/trunk@61635 602fd350-edb4-49c9-b593-d223f7449a82

Author: joedolson

src/wp-content/themes/twentytwentyone/assets/css/ie-editor.css.map

@@ -1,35 +1 @@
-/**
- * File skip-link-focus-fix.js.
- *
- * Helps with accessibility for keyboard only users.
- *
- * This is the source file for what is minified in the twenty_twenty_one_skip_link_focus_fix() PHP function.
- *
- * Learn more: https://git.io/vWdr2
- *
- * @since Twenty Twenty-One 1.0
- */
-( function() {
-	var isIe = /(trident|msie)/i.test( navigator.userAgent );
-
-	if ( isIe && document.getElementById && window.addEventListener ) {
-		window.addEventListener( 'hashchange', function() {
-			var id = location.hash.substring( 1 ),
-				element;
-
-			if ( ! ( /^[A-z0-9_-]+$/.test( id ) ) ) {
-				return;
-			}
-
-			element = document.getElementById( id );
-
-			if ( element ) {
-				if ( ! ( /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) ) {
-					element.tabIndex = -1;
-				}
-
-				element.focus();
-			}
-		}, false );
-	}
-}() );
+// Internet Explorer support was removed.