Doc: update doxygen-awesome-css usage

Author: imbobz

.gitmodules

@@ -7,10 +7,10 @@ project(cae
 list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/modules")
 
 set(CMAKE_CXX_STANDARD 23)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_C_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_C_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_C_EXTENSIONS OFF)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/lib")

CMakeLists.txt

@@ -6,6 +6,11 @@ endif()
 
 find_package(Doxygen REQUIRED)
 
+file(DOWNLOAD https://raw.githubusercontent.com/jothepro/doxygen-awesome-css/v2.4.1/doxygen-awesome.css
+        ${CMAKE_CURRENT_BINARY_DIR}/doxygen-awesome.css)
+file(DOWNLOAD https://raw.githubusercontent.com/jothepro/doxygen-awesome-css/v2.4.1/doxygen-awesome-sidebar-only.css
+        ${CMAKE_CURRENT_BINARY_DIR}/doxygen-awesome-sidebar-only.css)
+
 set(DOXYGEN_DIR "${CMAKE_SOURCE_DIR}/documentation/.doxygen")
 set(DOXYFILE_OUT "${CMAKE_CURRENT_BINARY_DIR}/Doxyfile")
 configure_file("${DOXYGEN_DIR}/Doxyfile" ${DOXYFILE_OUT} @ONLY)

cmake/modules/MakeDoc.cmake

@@ -1,6 +1,6 @@
 HTML_EXTRA_FILES       = @CMAKE_CURRENT_SOURCE_DIR@/assets/icons/favicon.ico
-HTML_EXTRA_STYLESHEET  = @CMAKE_CURRENT_SOURCE_DIR@/third-party/doxygen-awesome-css/doxygen-awesome.css \
-                         @CMAKE_CURRENT_SOURCE_DIR@/third-party/doxygen-awesome-css/doxygen-awesome-sidebar-only.css
+HTML_EXTRA_STYLESHEET  = @CMAKE_CURRENT_BINARY_DIR@/doxygen-awesome.css \
+                         @CMAKE_CURRENT_BINARY_DIR@/doxygen-awesome-sidebar-only.css
 HTML_HEADER            = @CMAKE_CURRENT_SOURCE_DIR@/documentation/.doxygen/header.html
 
 IMAGE_PATH             = @CMAKE_CURRENT_SOURCE_DIR@/assets/icons/