Fix redirect for videoUploadingWebCodecs

[austinEng]

Next.js redirects don't work for static-site generation because it can't generate a .html file for the page.

Follow-up on #364 and #365

[kainino0x]

@austinEng
https://webgpu.github.io/webgpu-samples/samples/videoUploadingWebCodecs
now redirects to
https://webgpu.github.io/samples/videoUploading?videoSource=videoFrame
instead of
https://webgpu.github.io/webgpu-samples/samples/videoUploading?videoSource=videoFrame

[austinEng]

ugh yea.
somehow it still doesn't work.

Deployed gh page:
https://github.com/webgpu/webgpu-samples/blob/gh-pages/samples/videoUploadingWebCodecs.html

has

<meta http-equiv="refresh" content="0; url=/webgpu-samples/samples/videoUploading?videoSource=videoFrame"/>

in it

but yea, I get redirected to
/samples/videoUploading?videoSource=videoFrame instead

[austinEng]

OH. I see. in the sources panel, the redirect url is correct.

but if I break in DOMWindow.load - before redirect happens, it is wrong.

Basically, it seem JS is loading, changing the meta tag, and then it redirects... :-/

[beaufortfrancois]

Thank you @austinEng and @kainino0x for addressing this issue!