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docs: Site particle docs (#3531)

Closes #3528

## Changes:

- Cleans up particle documentation to reflect current particle emitter
  - nested particle structure
  - replace vel for speed
  - additional comments explaining more of the properties
  - adds embedded examples
- Playground emebed
  - More notes [here](https://github.com/excaliburjs/Excalibur/issues/3528#issuecomment-3368702814)
  - It could be useful to have an "?embed" version of the playground where it hides the header, specifically for the docs
  - Open to _not_ having this
- Added initial docs style guide
  - Open to change, its more a reference for myself - nearly every time I modify the docs I do a quick search for "now, do we refer to it as Excalibur or Excalibur.js?"

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