doxygen: create framework to unify markdown and source code part (#9946)

* doxygen: adjust documentation directory structure

- Rename documentation/doxygen to documentation/0.doxygen and cleanup
  some unused files.

- Add/rename folders for each sub sections, such as
  1.introduction/...... Each sub section will be created as a subpage.

- Generate initial Doxyfile, this Doxyfile will be used to unify
  doxygen generated API documents and those markdown files under
  documentation folder. This patch just add the default Doxyfile
  generated by running "doxygen -g". It is used as baseline to add
  more features/configurations.

- Rename documentation/README.md to documentation/INDEX.md, and
  use it as mainpage.

- Move 0.doxygen/readme.md to documentation/README.md.

* doxygen: update configurations

These configurations are from old documentation/doxygen/Doxyfile.
Try best to compatible exixting design.

* doxygen: add run script

Add a script to automatic some operations.

Updated the README.md.

---------

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Co-authored-by: Supper Thomas <78900636@qq.com>

documentation/0.doxygen/module.h

@@ -0,0 +1,14 @@
+/*
+ * This file is only used for doxygen document generation.
+ */
+
+/**
+ * @defgroup Module Application Module
+ *
+ * @brief Application Module is a feature let user to execute application in RT-Thread RTOS.
+ *
+ * Application Module is implemented as dynamic object loader, but it can handle
+ * the dependences relationship between application and dynamic library, moreover,
+ * it also can handle the kernel object destroy and memory release issue when application
+ * (abnormally) exit.
+ */