[UIA-1389] Remove the beta badge from the Workflow Groups page + update docs

[semiramaria]

Update the documentation after removing the beta badge from the Workflow Groups page

[CLAassistant]

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[semiramaria]

This will be merged with new version of workflow commons with Mendix 11.6. I will let you know when its ready. Thanks

[Yiyun333]

@semiramaria Thank you for re-opening this PR. Could you also sign the Contributor License Agreement for us? 🥇