doc: use doxygen-awesome-css

docs/CMakeLists.txt

@@ -2,7 +2,22 @@
 # Doxygen configuration (documentation)
 #
 
+FetchContent_Declare(
+    doxygen-awesome-css
+    GIT_REPOSITORY https://github.com/jothepro/doxygen-awesome-css
+    GIT_TAG main
+    GIT_SHALLOW 1
+)
+
+FetchContent_GetProperties(doxygen-awesome-css)
+
+if(NOT doxygen-awesome-css_POPULATED)
+    FetchContent_Populate(doxygen-awesome-css)
+    set(doxygen-awesome-css_INCLUDE_DIR ${doxygen-awesome-css_SOURCE_DIR})
+endif()
+
 set(DOXY_SOURCE_DIRECTORY ${EnTT_SOURCE_DIR}/src)
+set(DOXY_CSS_DIRECTORY ${doxygen-awesome-css_INCLUDE_DIR})
 set(DOXY_DOCS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
 set(DOXY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 

docs/doxy.in

@@ -1302,7 +1302,7 @@ HTML_FOOTER            =
 # obsolete.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_STYLESHEET        =
+HTML_STYLESHEET        = @DOXY_CSS_DIRECTORY@/doxygen-awesome.css
 
 # The HTML_EXTRA_STYLESHEET tag can be used to specify additional user-defined
 # cascading style sheets that are included after the standard style sheets
@@ -1343,7 +1343,7 @@ HTML_EXTRA_FILES       =
 # The default value is: AUTO_LIGHT.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_COLORSTYLE        = AUTO_LIGHT
+HTML_COLORSTYLE        = LIGHT
 
 # The HTML_COLORSTYLE_HUE tag controls the color of the HTML output. Doxygen
 # will adjust the colors in the style sheet and background images according to