Fix .gitignore

.gitignore

@@ -44,16 +44,13 @@
 !examples/**/*.html.disabled
 
 # include directory:
-!include/ftxui/
 !include/ftxui/**/*.hpp
 !include/ftxui/**/*.cpp
 
 # src directory:
-!src/
 !src/ftxui/**/*.hpp
 !src/ftxui/**/*.cpp
 
 # tools directory:
-!tools/
 !tools/**/*.sh
 !tools/**/*.cpp