feat: onboarding steps

[pateljannat]

onboarding.mp4

1. On a brand new site, Moderators will now see onboarding steps.
2. They can skip the onboarding if they already know their way around, and that would hide the banner forever.
3. But if they don't have experience with the system, they can follow the steps.
4. The steps are simple: create a course, create a chapter, then create a lesson.
5. The first step is enabled, and the other two are disabled.
6. Clicking on the first steps takes them to the course form. When they create the course, the first step gets completed, and the second step becomes active.
7. Clicking on the second step takes them to the course form of the first course in the system. There, they need to add a chapter. When they do so, the second step is complete, and the third step becomes active.
8. Clicking on the third step takes them to the lesson form, which would be the first lesson in the chapter they just created. When they create the lesson, the onboarding is complete, and the banner goes away.

[cypress]

lms    Run #841

Run Properties:   Passed #841  •  b1f540ffb3 ℹ️: Merge 58f109e79c48680c199cfe8e37a07af25536943d into 7cafaf5cbcb30963429bc46110a3...

Project	lms
Branch Review	onboarding-steps
Run status	Passed #841
Run duration	00m 31s
Commit	b1f540ffb3 ℹ️: Merge 58f109e79c48680c199cfe8e37a07af25536943d into 7cafaf5cbcb30963429bc46110a3...
Committer	Jannat Patel
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Flaky	0
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[frappe-pr-bot]

🎉 This PR is included in version 2.13.0 🎉

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