XWIKI-16182: Hide the Rendering space from the Navigation Panel by default

+ make the Index Application space name simper for a better display in XWiki's UI
+ remove the space wording

xwiki-platform-core/xwiki-platform-index/xwiki-platform-index-ui/src/main/resources/Index/WebHome.xml

@@ -31,10 +31,10 @@
   <author>xwiki:XWiki.Admin</author>
   <contentAuthor>xwiki:XWiki.Admin</contentAuthor>
   <version>1.1</version>
-  <title>Index Application Home</title>
+  <title>Index</title>
   <comment/>
   <minorEdit>false</minorEdit>
   <syntaxId>xwiki/2.1</syntaxId>
   <hidden>true</hidden>
-  <content>This space contains technical pages for the Index Application.</content>
+  <content>This page and children contain technical pages for the Index Application.</content>
 </xwikidoc>

xwiki-platform-core/xwiki-platform-rendering/xwiki-platform-rendering-ui/src/main/resources/Rendering/WebHome.xml

+<?xml version="1.1" encoding="UTF-8"?>
+
+<!--
+ * See the NOTICE file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+-->
+
+<xwikidoc version="1.3" reference="Rendering.WebHome" locale="">
+  <web>Rendering</web>
+  <name>WebHome</name>
+  <language/>
+  <defaultLanguage/>
+  <translation>0</translation>
+  <creator>xwiki:XWiki.Admin</creator>
+  <parent>Main.WebHome</parent>
+  <author>xwiki:XWiki.Admin</author>
+  <contentAuthor>xwiki:XWiki.Admin</contentAuthor>
+  <version>1.1</version>
+  <title>Rendering</title>
+  <comment/>
+  <minorEdit>false</minorEdit>
+  <syntaxId>xwiki/2.1</syntaxId>
+  <hidden>true</hidden>
+  <content>This page and children contain technical pages for the Rendering Application.</content>
+</xwikidoc>