Fix PowerShell module installation path on Windows

[nachomata]

The Windows MSI installer for version 32.1.1 was placing the file corteca.ps1 in $HOME\Documents\PowerShell\Modules.
However when trying to import the module to enable autocompletion functionality, PowerShell throws the following error:

Import-Module -Name corteca
Import-Module: The specified module 'corteca' was not loaded because no valid module file was found in any module directory.

This PR fixes the issue by:

• Moving the file to a subfolder named Corteca (as required for PowerShell modules)
• Renaming the file from .ps1 to .psm1 so that it is recognized as a valid module.

After this change, running Import-Module -Name Corteca works as expected and enables autocompletions.

Could be interesting to considering adding Import-Module -Name Corteca to $PROFILE when corteca is installed or create a module manifest to enable auto-import.

Let me know if there’s anything you’d like to adjust. Thanks! 😊