Update docs to more clearly indicate usage

[MaximumMaxxx]

Hello,

If you only rely on the documentation from NPM or the project's website, you might encounter a problem where the component appears broken because the container size isn't big enough. It would be a good idea to update the docs to include styling instructions, so that if someone copies the code, the project won't look broken.

Current docs:

Proposed change:

[MaximumMaxxx]

Alternatively instead of inline styles you could add a section about styling and include the css like in the demo

<style>
    .scrolly-video-container {
        height: 300vh;
    }
</style>

[tarsisexistence]

@MaximumMaxxx isn't the proposed solution wrong in terms of applying height on the video (or canvas) element instead of the container?

We can probably highlight this for every usage in README by wrapping the scrolly video element with a container of 300vh.