Converted PowerShell code to use Splatting, and newer PS7 parameters (where available)

[Natfan]

Also removed the requirement for UseBasicParsing, as Invoke-RestMethod already converts XML/JSON to PSObjects as required.

More info on splatting: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_splatting
More info on Invoke-RestMethod: https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/invoke-restmethod

[binwiederhier]

This is great, thank you. I'll likely merge this tomorrow. I gotta say I mostly was winging the PS examples, so I'm glad somebody actually fixed them up :-D

[binwiederhier]

Had to fix up some formatting, but other than that it looks great.

Note that there is one example that doesn't have a PS example yet, because I didn't know how to do it. If you're interested, you can fix that too: https://docs.ntfy.sh/publish/#attach-local-file