Add a redirect for FSDP advanced tutorial and recipes page (#3542)

* Add redirect to the FSDP tutorial
* Add redirect of the recipes_index page


cc @wconstab @osalpekar @H-Huang @kwen2501

Author: svekars

redirects.py

@@ -3,6 +3,7 @@
     "beginner/ptcheat.html": "../index.html",
     "beginner/deploy_seq2seq_hybrid_frontend_tutorial.html": "../index.html",
     "recipes/bundled_inputs.html": "../index.html",
+    "recipes/recipes_index.html": "../recipes_index.html",
     "advanced/super_resolution_with_onnxruntime.html": "../index.html",
     "intermediate/torchserve_with_ipex.html": "../index.html",
     "intermediate/torchserve_with_ipex_2.html": "../index.html",
@@ -12,6 +13,7 @@
     "advanced/dynamic_quantization_tutorial.html": "../index.html",
     "intermediate/dynamic_quantization_bert_tutorial.html": "../index.html",
     "intermediate/quantized_transfer_learning_tutorial.html": "../index.html",
+    "intermediate/FSDP_adavnced_tutorial.html": "https://docs.pytorch.org/tutorials/intermediate/FSDP_advanced_tutorial.html",
     "prototype/graph_mode_dynamic_bert_tutorial.html": "../index.html",
     "prototype/flight_recorder_tutorial.html": "https://docs.pytorch.org/tutorials/unstable/flight_recorder_tutorial.html",
     "prototype/fx_graph_mode_ptq_dynamic.html": "../index.html",