Update documentation.

- Convert http to https, provide archive link when possible.
- Made CPU-JIT.png more readable on dark themes;
Added a white background so there isn't black text on a black
background.

src/xenia/gpu/graphics_system.cc

@@ -26,8 +26,8 @@ namespace gpu {
 // Nvidia Optimus/AMD PowerXpress support.
 // These exports force the process to trigger the discrete GPU in multi-GPU
 // systems.
-// http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf
-// http://stackoverflow.com/questions/17458803/amd-equivalent-to-nvoptimusenablement
+// https://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf
+// https://stackoverflow.com/questions/17458803/amd-equivalent-to-nvoptimusenablement
 #if XE_PLATFORM_WIN32
 extern "C" {
 __declspec(dllexport) uint32_t NvOptimusEnablement = 0x00000001;
@@ -74,7 +74,7 @@ X_STATUS GraphicsSystem::Setup(cpu::Processor* processor,
           "Ensure you have the latest drivers for your GPU and "
           "that it supports Vulkan.\n"
           "\n"
-          "See http://xenia.jp/faq/ for more information and a list of "
+          "See https://xenia.jp/faq/ for more information and a list of "
           "supported GPUs.");
       return X_STATUS_UNSUCCESSFUL;
     }