moving kernel code to kernel/

docs/framebuffer.md

@@ -9,7 +9,7 @@ write a 32-bit value to the right address, and a pixel changes color. That's
 exactly what `Console.pixel` does:
 
 ```zig
-self.rowPtr(y)[x] = color;   // src/console.zig
+self.rowPtr(y)[x] = color;   // src/kernel/console.zig
 ```
 
 Our `Framebuffer` struct (`src/root.zig`) is the four facts you need to