Rewrite `docs/commands.html` as a toggle-driven cheat sheet for PowerShell cmdlets and the standalone `nova` launcher.

[stiwicourage]

Summary

Rewrite docs/commands.html as a toggle-driven cheat sheet for PowerShell cmdlets and the standalone nova launcher.

Problem

docs/commands.html currently mixes PowerShell and CLI explanation in a way that makes the page less effective as a fast command lookup reference. The page should help users quickly find the right command once they already understand NovaModuleTools.

Scope

Rewrite docs/commands.html so that:

• the selected toggle drives the visible command surface
• PowerShell mode reads like a cmdlet cheat sheet
• command-line mode reads like a nova cheat sheet
• narrative explanation is secondary to quick lookup

Content direction

• make the CLI positioning more precise
• reflect that nova is especially relevant for macOS/Linux users who want a platform-native command-line experience
• keep PowerShell cmdlets positioned as the native scripted experience in pwsh
• avoid recommending Invoke-NovaCli as an end-user entrypoint

Acceptance criteria

• the page works as a fast lookup/reference page
• the selected surface determines the examples and surrounding guidance
• mixed-surface narrative blocks are removed or reduced significantly
• deeper guide links remain available but secondary
• the page no longer feels like combined cmdlet help

Out of scope

• other website guide pages
• PlatyPS cleanup
• launcher architecture changes