fix doc: big update

- use single doxyfile instead of one per module
- use a cleaner and more modern style
- reorder sections to put details first
- hide diagrams by default
- remove deprecated doxygen variables
- disable latex generation by default
- fix some doc typos

mo/doc/CMakeLists.txt

@@ -19,7 +19,8 @@ if(DOXYGEN_FOUND)
                 WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
         endif(UNIX AND NOT ${CMAKE_VERBOSE_MAKEFILE})
     endif(DOXYGEN_EXECUTABLE)
-    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/${MO_DOC_CONFIG_FILE}.cmake"
+    # configure_file("${CMAKE_CURRENT_SOURCE_DIR}/${MO_DOC_CONFIG_FILE}.cmake"
+    configure_file("${CMAKE_SOURCE_DIR}/doxyfile.cmake"
                    "${MO_DOC_DIR}/${MO_DOC_CONFIG_FILE}")
     install(
         DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}