Remove MAUI reference in readme

[ThomasNieto]

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Prerequisites

• [X] Write a descriptive title.
• [X] Make sure you are able to repro it on the latest version
• [X] Search the existing issues.

Steps to reproduce

Per https://github.com/PowerShell/ConsoleGuiTools/issues/101#issuecomment-1652636165 the following statement should be removed from the readme.

Note: A module named Microsoft.PowerShell.GraphicalTools used to be built and published out of this repo, but per https://github.com/PowerShell/ConsoleGuiTools/issues/101 it is deprecated and unmaintained until such time that it can be rewritten on top of .NET MAUI.

Expected behavior

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Actual behavior

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Error details

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Environment data

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Version

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Visuals

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