Remove TorchAudio from HUD top menu (#8246)

## Summary

torchaudio is currently in maintenance phase, so this removes its entry
(`/hud/pytorch/audio/main`) from the HUD top navigation bar.

## Change

- Drop the `TorchAudio` `<li>` link from
`torchci/components/layout/NavBar.tsx`.

No other references to the audio HUD in the nav are affected.

Co-authored-by: atalman <atalman@users.noreply.github.com>

Author: atalman

torchci/components/layout/NavBar.tsx

@@ -155,11 +155,6 @@ function NavBar() {
               TorchVision
             </Link>
           </li>
-          <li>
-            <Link prefetch={false} href="/hud/pytorch/audio/main">
-              TorchAudio
-            </Link>
-          </li>
           <li>
             <Link prefetch={false} href="/hud/pytorch/helion/main">
               Helion