Organize pages into directories and shorter file names.  Use lower-case
names for directories and capitalized names for files.  This produces a
pleasing sort order in the GitLab Wiki navigation page.

Also rename entry page `CMake.md` to `Home.md` to match GitLab Wiki
conventions.

doc/Tutorials.md

+__TOC__
+
+This page is not yet fully organized. Please see other tutorials on the
+[top page](CMake#Tutorials "wikilink").
+
+# CMake
+
+### CMake Packages
+
+  - [Exporting and Importing
+    Targets](CMake/Tutorials/Exporting_and_Importing_Targets "wikilink")
+  - [Packaging](CMake/Tutorials/Packaging "wikilink")
+  - [Package Registry](CMake/Tutorials/Package_Registry "wikilink")
+  - [How to create a ProjectConfig.cmake
+    file](CMake/Tutorials/How_to_create_a_ProjectConfig.cmake_file "wikilink")
+
+### Object Libraries
+
+  - [Object Library Overview](CMake/Tutorials/Object_Library "wikilink")
+
+### Cross-platform Development
+
+  - [Change behavior based on the available c++
+    environment](CMake/Tutorials/C++Compilers "wikilink")
+  - [Change c++11 flags based on the available c++
+    environment](CMake/Tutorials/C++11Flags "wikilink")
+  - [Using Qt through CMake on different
+    platforms](CMake/Tutorials/Qt "wikilink")
+
+### Convenience Techniques
+
+  - [Set a group of variables all at the same
+    time](CMake/Tutorials/SettingVariableGroups "wikilink")
+
+----
+This page was initially populated by conversion from its [original location](https://public.kitware.com/Wiki/CMake/Tutorials) in another wiki.