enh: Allow to disable automatically open the wizard

[susnux]

• Supersedes fix: Only show the wizard when any slides are configured (this is the default) #1106
• Resolves Don't show menu item if slides are disabled #708

[szaimen]

LGTM but didnt test

[github-actions]

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[onny]

Is it possible to disable the wizard through global config.php file?

[susnux]

@onny either with that config implemented here you can disable it globally from opening by default.
If you not even want it from being available as the "About" section of the user menu, then simply disable the app.