Add documentation about TPU support to the website

PiperOrigin-RevId: 710742221

Author: manninglucas

g3doc/user_guide/BUILD

@@ -65,6 +65,14 @@ doc(
     weight = "51",
 )
 
+doc(
+    name = "tpu",
+    src = "tpu.md",
+    category = "User Guide",
+    permalink = "/docs/user_guide/tpu/",
+    weight = "51",
+)
+
 doc(
     name = "runtime_monitoring",
     src = "runtime_monitoring.md",

website/BUILD

@@ -166,6 +166,7 @@ docs(
         "//g3doc/user_guide:production",
         "//g3doc/user_guide:runtime_monitoring",
         "//g3doc/user_guide:systemd",
+        "//g3doc/user_guide:tpu",
         "//g3doc/user_guide/containerd:configuration",
         "//g3doc/user_guide/containerd:containerd_11",
         "//g3doc/user_guide/containerd:quick_start",