feat: add web editor documentation

[meelrossi]

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[nearnshaw]

Very well written @meelrossi!
I did some minor adjustments here and there, but it was already really good :)

[nearnshaw]

I noticed this PR moves the examples page up a level
Even though that logically makes sense bc there was only one page in that section, it doesn't look that good visually:

I find it confusing, I tend to think it's a subsection of the one above
And the same happens with the new Web editor lose document
I think it would be worth for the web editor to also have its own folder, in the future I think we'll likely have more content there also, surely for smart items we can have one separate page soon

@meelrossi