Revert "Add character count as you type"

This reverts commit fbc4abf85d.

app/assets/javascripts/characterCount.js

@@ -1,39 +0,0 @@
-(function(Modules) {
-  "use strict";
-
-  Modules.CharacterCount = function() {
-
-    this.start = function(component) {
-
-      var getCharacterCount = () =>
-        ($textarea.val()).length;
-
-      var getLengthOfOneMessage = () =>
-        160 - (serviceName + ': ').length;
-
-      var $component = $(component);
-
-      var serviceName = $component.data('service-name');
-
-      var $textarea = $('textarea', $component)
-        .eq(0)
-        .on('change keyup paste', () => $counter.html(`
-          ${getCharacterCount()} of ${getLengthOfOneMessage()} characters
-        `));
-
-      $component
-        .append($counter = $(`
-          <p class="textbox-character-count"
-            role="status" aria-live="polite" aria-relevant="text"
-            id="word-count-${$textarea.prop('name')}"
-          />
-        `));
-
-      $textarea
-        .trigger('change');
-
-    };
-
-  };
-
-})(window.GOVUK.Modules);