add dApp staking v3 onboarding modal

[ayumitk]

Pull Request Summary

Added dApp staking v3 onboarding modal

• After closing the disclaimer modal, this onboarding modal will show.
• When users close the modal once, that records to the local storage, and the modal will never show up unless users clean their local storage.
• This modal is visible on Shibuya and Shiden

Check list

• contains breaking changes
• adds new feature
• modifies existing feature (bug fix or improvements)
• relies on other tasks
• documentation changes
• tested on mobile devices

This pull request makes the following changes:

Adds

[github-actions]

Visit the preview URL for this PR (updated for commit 44cc8ef):

https://astar-apps--pr1142-feat-onboarding-moda-g0wnzsil.web.app

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[Kahonnohak]

I would like to come back to this modal next week.

Question : can we show this modal for everyone (with or without portal cookies) from the launch on Astar. And keep showing when visiting Portal until user press a button press "not to show again" ?

[Kahonnohak]

Hi @ayumitk

Sorry please add small changes before merging

• Text change
  Go to dApp Staking -> What is dApp Staking?

• link
  https://docs.astar.network/docs/learn/dapp-staking/

• User guides link
  https://docs.astar.network/docs/use/dapp-staking/for-stakers/

All good otherwise please merge after the change

[Kahonnohak]

LGTM