Documentation: Move doc-icon.png from the root to dist.

Doxyfile

@@ -51,7 +51,7 @@ PROJECT_BRIEF          = "Nintendo 3DS emulator/debugger"
 # and the maximum width should not exceed 200 pixels. Doxygen will copy the logo
 # to the output directory.
 
-PROJECT_LOGO           = doc-icon.png
+PROJECT_LOGO           = dist/doc-icon.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is