Reorganizes events page, adds missing events

[Faxmashine]

Also removes OnSpawn because it's deprecated

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🚀 Deployed on https://641a40674ffd260c34b104d8--vrc-udonsharp.netlify.app

[momo-the-monster]

@Faxmashine - I like how you've broken up the Udon events. With the Unity events in a single long list, they take up a lot more space now, and are probably less useful for regular reference - how about we move them to appear after the Udon events?

[Faxmashine]

I've moved it to the end of the document.

It was initially a table, which was more difficult to maintain. But it was more compact! I don't think Docusaurus has a convenient way for us to automate or replicate that.

[momo-the-monster]

Yeah, we could write our own automation to present the values in a more compact format, but it would probably be better to find a community plugin or something similar.