fix(scale): add missing scale element

[tosinamuda]

Fixes bug: Uncaught TypeError: Cannot read properties of null (reading 'addEventListener') at main.js:38:13

Cause

While scaleSlider and scaleLabel are defined in main.js, there are missing in the index.html dom

const scaleSlider = document.getElementById('scale');
const scaleLabel = document.getElementById('scale-value');

This leads to a uncaught error which doesn't allow the example to work in the line below:

// Set up controls
let scale = 0.5;
scaleSlider.addEventListener('input', () => {
    scale = Number(scaleSlider.value);
    setStreamSize(video.videoWidth * scale, video.videoHeight * scale);
    scaleLabel.textContent = scale;
});
scaleSlider.disabled = false;

[xenova]

Thanks! Even though we are moving our examples to https://github.com/huggingface/transformers.js-examples/, this is a good thing to fix :)

[HuggingFaceDocBuilderDev]

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