Fix links

Used a wrong format that does not work with Antora

Author: SaschaWillems

en/02_Development_environment.adoc

@@ -72,8 +72,8 @@ your auto-start for your terminal and IDE setup such that those environment
 variables work everywhere.
 
 If you receive an error message, then ensure that your drivers are up to date,
-include the Vulkan runtime and that your graphics card is supported. See the
-[introduction chapter](!en/Introduction) for links to drivers from the major
+include the Vulkan runtime and that your graphics card is supported. See the 
+xref:00_Introduction.adoc[introduction chapter] for links to drivers from the major
 vendors.
 
 === CMake

en/03_Drawing_a_triangle/00_Setup/00_Base_code.adoc

@@ -291,6 +291,6 @@ in the cleanup() function. This code will never need to change again.
 
 When you run the program now, you should see a window titled `Vulkan` show up
 until the application is terminated by closing the window. Now that we have the
-skeleton for the Vulkan application, let's [create the first Vulkan object](!en/Drawing_a_triangle/Setup/Instance)!
+skeleton for the Vulkan application, let's xref:./01_Instance.adoc[create the first Vulkan object]!
 
 link:/attachments/00_base_code.cpp[C{pp} code]

en/03_Drawing_a_triangle/00_Setup/01_Instance.adoc

@@ -220,6 +220,6 @@ that checks if all the extensions returned by
 list.
 
 Before continuing with the more complex steps after instance creation, it's time
-to evaluate our debugging options by checking out (!en/Drawing_a_triangle/Setup/Validation_layers)[validation layers].
+to evaluate our debugging options by checking out xref:./02_Validation_layers.adoc[validation layers].
 
 link:/attachments/01_instance_creation.cpp[C{pp} code]

en/03_Drawing_a_triangle/01_Presentation/01_Swap_chain.adoc

@@ -469,7 +469,7 @@ your swap chain becomes invalid or unoptimized while your application is
 running, for example, because the window was resized. In that case, the swap chain
 actually needs to be recreated from scratch, and a reference to the old one must
 be specified in this field. This is a complex topic that we'll learn more about
-in [a future chapter](!en/Drawing_a_triangle/Swap_chain_recreation). For now, we'll assume that we'll only ever create
+in xref:03_Drawing_a_triangle/04_Swap_chain_recreation.adoc[a future chapter]. For now, we'll assume that we'll only ever create
 one swap chain.
 
 Now add a class member to store the `VkSwapchainKHR` object:
@@ -494,7 +494,7 @@ Now run the application to ensure that the swap chain is created
 successfully! If at this point you get an access violation error in
 `vkCreateSwapchainKHR` or see a message like `Failed to find
 'vkGetInstanceProcAddress' in layer SteamOverlayVulkanLayer.dll`, then see
-the [FAQ entry](!en/FAQ) about the Steam overlay layer.
+the xref:90_FAQ.adoc[FAQ entry] about the Steam overlay layer.
 
 Try removing the `createInfo.imageExtent = extent;` line with validation layers
 enabled. You'll see that one of the validation layers immediately catches the