Reorganise nodes into new categories

packages/node_modules/@node-red/nodes/locales/en-US/function/15-change.html

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+<!--
+  Copyright JS Foundation and other contributors, http://js.foundation
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+
+<script type="text/x-red" data-help-name="change">
+    <p>Set, change, delete or move properties of a message, flow context or global context.</p>
+    <p>The node can specify multiple rules that will be applied in the order they are defined.</p>
+    <h3>Details</h3>
+    <p>The available operations are:</p>
+    <dl class="message-properties">
+    <dt>Set</dt>
+    <dd>set a property. The value can be a variety of different types, or
+            can be taken from an existing message or context property.</dd>
+    <dt>Change</dt>
+    <dd>search &amp; replace parts of the property. If regular expressions
+        are enabled, the "replace with" property can include capture groups, for
+        example <code>$1</code>. Replace will only change the type if there
+        is a complete match.</dd>
+    <dt>Delete</dt>
+    <dd>delete a property.</dd>
+    <dt>Move</dt>
+    <dd>move or rename a property.</dd>
+    </dl>
+    <p>The "expression" type uses the <a href="http://jsonata.org/" target="_new">JSONata</a>
+    query and expression language.
+    </p>
+</script>