docs: added docs page about checking permissions

[Commandserver]

This PR adds a new docs page about permissions and makes the glossar appear at the top of the "related pages".

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[Commandserver]

what do you think? does the new page fit more in "The basics", in "Misc Examples" or in "Advanced Reference"?

[Mishura4]

I would put it in Interactions and Components tbh!
Though the basics could work