cmake: remove redundant doxygen file

CMakeLists.txt

@@ -1159,23 +1159,11 @@ else()
 endif()
 
 if(BUILD_DOCUMENTATION)
-  set(DOC_GRAPHS "YES" CACHE STRING "Create dependency graphs (needs graphviz)")
-  set(DOC_FULLGRAPHS "NO" CACHE STRING "Create call/callee graphs (large)")
-
-  find_program(DOT_PATH dot)
-
-  if (DOT_PATH STREQUAL "DOT_PATH-NOTFOUND")
-    message("Doxygen: graphviz not found - graphs disabled")
-    set(DOC_GRAPHS "NO")
-  endif()
-
   find_package(Doxygen)
   if(DOXYGEN_FOUND)
-    configure_file("cmake/Doxyfile.in" "Doxyfile" @ONLY)
-    configure_file("cmake/Doxygen.extra.css.in" "Doxygen.extra.css" @ONLY)
     add_custom_target(doc
-      ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
-      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+      ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile
+      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
       COMMENT "Generating API documentation with Doxygen.." VERBATIM)
   endif()
 endif()

cmake/Doxygen.extra.css.in

@@ -1,14 +0,0 @@
-/* increase vertical space */
-#titlearea, #nav-path {
-    display: none;
-    height: 0px;
-}
-
-
-/* uncomment these lines for some extra vertical space */
-
-/*
-.tablist li {
-    line-height: 26px;
-}
-*/