Refactor menu PIO IDE & CLI in docs

docs/ide/cloud9.rst

@@ -0,0 +1,28 @@
+..  Copyright 2014-present PlatformIO <contact@platformio.org>
+    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.
+
+.. _ide_cloud9:
+
+Cloud9
+======
+
+`Cloud9 <https://c9.io/>`_ combines a powerful online code editor with a full
+Ubuntu workspace in the cloud.
+Workspaces are powered by Docker Ubuntu containers that give you full freedom
+over your environment, including sudo rights. Do a git push, compile SASS, see
+server output, and Run apps easily with the built-in Terminal and Runners.
+
+.. contents::
+
+Integration
+-----------
+
+@TODO