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/ui/vulkan/vulkan_provider.cc

@@ -34,7 +34,7 @@ std::unique_ptr<VulkanProvider> VulkanProvider::Create(Window* main_window) {
         "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 supported "
+        "See https://xenia.jp/faq/ for more information and a list of supported "
         "GPUs.");
     return nullptr;
   }

src/xenia/ui/vulkan/vulkan_util.cc

@@ -403,7 +403,7 @@ void FatalVulkanError(std::string error) {
       "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 supported "
+      "See https://xenia.jp/faq/ for more information and a list of supported "
       "GPUs.");
 }