Updated the listed requirements and installation methods.

[DandelionSprout]

• I have signed the Contributor License Agreement.
• I have updated the Release Notes.
• This pull request is related to an issue.

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Notes from me:

• Added Windows 11 and Windows Server 2025 to the list of supported OS's. After all, winget support was a frequent marketing point in Server 2025's marketing.
• From what I've been able to tell through web searches, pretty much no one ever got it to work in Windows Server 2022.
• Sorted the installation method list so that all Regular channel releases of Winget were above the Development channel ones. Currently they had been listed as "Regular (MS Store) → Development → Regular (GitHub)".
• Added the way (as far as I can tell) to install the Regular channel from scratch with PowerShellGet.
• Somewhat clarified the MS Store app eligibilities.

Microsoft Reviewers: Open in CodeFlow

[JohnMcPMS]

@denelon to review as well.

[JohnMcPMS]

Looks fine with me.