Revert examples change + add doc.

doc/Doxyfile.in

@@ -345,14 +345,8 @@ OPTIMIZE_OUTPUT_SLICE  = NO
 #
 # Note see also the list of default file extension mappings.
 
-EXTENSION_MAPPING      =  \
-  c=cpp \
-  cc=cpp \
-  cpp=cpp \
-  cxx=cpp \
-  h=cpp \
-  hh=cpp \
-  cmake=cmake \
+EXTENSION_MAPPING      = 
+
 
 # If the MARKDOWN_SUPPORT tag is enabled then doxygen pre-processes all comments
 # according to the Markdown format, which allows for more readable
@@ -964,7 +958,6 @@ INPUT                  = \
                          @CMAKE_CURRENT_SOURCE_DIR@ \
                          @CMAKE_SOURCE_DIR@/include \
                          @CMAKE_SOURCE_DIR@/src \
-                         @CMAKE_SOURCE_DIR@/cmake \
                          @CMAKE_CURRENT_BINARY_DIR@ \
                          @CMAKE_SOURCE_DIR@/examples \
 
@@ -1008,15 +1001,48 @@ INPUT_FILE_ENCODING    =
 
 FILE_PATTERNS          = *.c \
                          *.cc \
+                         *.cxx \
                          *.cpp \
+                         *.c++ \
+                         *.java \
+                         *.ii \
+                         *.ixx \
                          *.ipp \
+                         *.i++ \
                          *.inl \
+                         *.idl \
+                         *.ddl \
+                         *.odl \
                          *.h \
+                         *.hh \
+                         *.hxx \
                          *.hpp \
+                         *.h++ \
+                         *.cs \
+                         *.d \
+                         *.php \
+                         *.php4 \
+                         *.php5 \
+                         *.phtml \
                          *.inc \
+                         *.m \
+                         *.markdown \
                          *.md \
-                         *.cmake \
-
+                         *.mm \
+                         *.dox \
+                         *.py \
+                         *.pyw \
+                         *.f90 \
+                         *.f95 \
+                         *.f03 \
+                         *.f08 \
+                         *.f \
+                         *.for \
+                         *.tcl \
+                         *.vhd \
+                         *.vhdl \
+                         *.ucf \
+                         *.qsf
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.

doc/cpp-modules.md

@@ -80,3 +80,8 @@ are available:
     - `ftxui.util`
         - `ftxui.util.AutoReset`
         - `ftxui.util.Ref`
+
+> ![NOTE] The list can be generated with the following command:
+> ```sh
+> git grep "export module" | cut -d: -f2 | cut -d\  -f3
+> ```