Reorganise nodes into new categories

packages/node_modules/@node-red/nodes/locales/en-US/common/98-unknown.html

@@ -0,0 +1,28 @@
+<!--
+  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="unknown">
+    <p>This node is a type unknown to your installation of Node-RED.</p>
+    <h3>Details</h3>
+    <p><i>If you deploy with the node in this state, its configuration will be preserved, but
+    the flow will not start until the missing type is installed.</i></p>
+    <p>Use the <code>Menu - Manage Palette</code> option
+    to search for and install nodes, or <b>npm install &lt;module&gt;</b> to
+    install, any missing modules and restart Node-RED and reimport the nodes.</p>
+    <p>It is possible this node type is already installed, but is missing a dependency. Check the Node-RED start-up
+    log for any error messages associated with the missing node type.</p>
+    <p>Otherwise, you should contact the author of the flow to obtain a copy of the missing node type.</p>
+</script>