omcbride

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This is just an update of https://github.com/gillissm/TheCodeAttic.Sitecore.InstallUtilities/blob/master/Sitecore-Uninstall-SIA/Sitecore-Uninstall-SIA.ps1 
to suport Sitecore 10.0 and 10.1 SIA installations.

Special thanks to:
- Scott Gillis for intial scripts
- Serge van den Oever's blog post - https://www.sergevandenoever.nl/Sitecore_93_Uninstall_SIA_Installed_Site/
- Kim - https://sitecore.stackexchange.com/a/11029

.SYNOPSIS