Fix outdated info in docs

[dmarcos]

There are tons of outdated info in the docs that have accumulated after the years: broken examples, mentions to old and deprecated headsets, old APIs...

I try to correct as I find issues but there's a lot. This is a great and easy way for anybody to contribute. Thanks everybody!

Docs are in this same repo: https://github.com/aframevr/aframe/tree/master/docs

[parthsali]

Hi @dmarcos,

I would like to work on this issue. Could you please assign it to me or let me know if there are any specific requirements or guidelines I should follow?

Thank you!

[dmarcos]

@parthsali Thanks. No need to assign it. If you see anything outdated in the docs feel free to open PRs. Let me know if you have any questions

[parthsali]

Got it, thanks! I'll keep an eye out for any outdated docs. Will reach out if I have any questions.

[vincentfretin]

See discussion supermedium/superframe#341 there is some outdated urls to aframe-layout-component somewhere...

[vincentfretin]

I did #5567 to update some urls.
If you find other issues while reading the documentation and experimenting, please don't hesitate to create a specific issue or create directly a PR if you know how to fix the issue.

[jinglechen2287]

Submitted #5644 to fix some outdated info that I encountered