Improve .NET Maui Support

[tobiaswittenburg]

Currently Maui seems to have not enough documentation (checked on the Context7 website).

Exchange the Maui documentation link to:
https://learn.microsoft.com/en-us/dotnet/maui/what-is-maui?view=net-maui-10.0
Include subsequent pages.

[enesgules]

Here you go: https://context7.com/websites/learn_microsoft_en-us_dotnet_maui