[all hosts] (DevX) Remove yo office next steps tip

[AlexJerabek]

yo office does not currently generate a set of next steps, as it used to. OfficeDev/generator-office#841 is tracking the restoration of that experience. In the interim, we should remove the reference to this non-existent text.

[learn-build-service-prod]

Learn Build status updates of commit 68af0ad:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/excludes/excel-quickstart-angular.md	✅Succeeded
docs/excludes/outlook-quickstart-json-manifest-typescript.md	✅Succeeded
docs/includes/yo-office-next-steps.md	✅Succeeded	n/a (file deleted or renamed)
docs/quickstarts/excel-quickstart-jquery.md	✅Succeeded	View
docs/quickstarts/excel-quickstart-react.md	✅Succeeded	View
docs/quickstarts/fluent-react-quickstart.md	✅Succeeded	View
docs/quickstarts/onenote-quickstart.md	✅Succeeded	View
docs/quickstarts/outlook-quickstart-yo.md	✅Succeeded	View
docs/quickstarts/powerpoint-quickstart-yo.md	✅Succeeded	View
docs/quickstarts/project-quickstart.md	✅Succeeded	View
docs/quickstarts/sso-quickstart.md	✅Succeeded	View
docs/quickstarts/word-quickstart-yo.md	✅Succeeded	View
docs/tutorials/excel-tutorial-create-custom-functions.md	✅Succeeded	View
docs/tutorials/excel-tutorial.md	✅Succeeded	View
docs/tutorials/outlook-tutorial.md	✅Succeeded	View
docs/tutorials/powerpoint-tutorial.md	✅Succeeded	View
docs/tutorials/word-tutorial.md	✅Succeeded	View

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