Delete Vulkan Tutortial (#3552)

Per tutorial audit, tutorial outdated

Author: sekyondaMeta

redirects.py

@@ -37,4 +37,5 @@
     "recipes/bundled_inputs.html": "../index.html",
     "recipes/recipes_index.html": "../recipes_index.html",
     "recipes/torchserve_vertexai_tutorial.html": "../index.html",
+    "unstable_source/vulkan_workflow.rst": "../index.html",
 }

unstable_index.rst

@@ -171,7 +171,6 @@ decide if we want to upgrade the level of commitment or to fail fast.
    unstable/inductor_cpp_wrapper_tutorial
    unstable/inductor_windows
    unstable/vmap_recipe
-   unstable/vulkan_workflow
    unstable/nestedtensor
    unstable/maskedtensor_overview
    unstable/maskedtensor_sparsity

unstable_source/README.txt

@@ -2,16 +2,12 @@ Prototype Tutorials
 ------------------
 1. distributed_rpc_profiling.rst
            Profiling PyTorch RPC-Based Workloads
-           https://github.com/pytorch/tutorials/blob/main/prototype_source/distributed_rpc_profiling.rst
+           https://github.com/pytorch/tutorials/blob/main/unstable_source/distributed_rpc_profiling.rst
 
-2. vulkan_workflow.rst
-           Vulkan Backend User Workflow
-           https://pytorch.org/tutorials/prototype/vulkan_workflow.html
-           
-3. flight_recorder_tutorial.rst
+2. flight_recorder_tutorial.rst
 	   Flight Recorder User Guide
 	   https://pytorch.org/tutorials/prototype/flight_recorder_tutorial.html
 
-4. python_extension_autoload.rst
+3. python_extension_autoload.rst
 	   Autoloading Out-of-Tree Extension
-	   https://pytorch.org/tutorials/prototype/python_extension_autoload.html
+	   https://github.com/pytorch/tutorials/blob/main/unstable_source/python_extension_autoload.rst