Addon Onboarding: New design and flow based on Save from Controls

[ghengeveld]

For #28181

What I did

This is a major overhaul of addon-onboarding. It includes a new splash screen (welcome modal), and updated guided tour. The code was refactored and logic was updated to make steps reactive to the actual state of Storybook (e.g. whether "save from controls" is visible).

The new onboarding no longer includes a "copy and paste" workflow to create a new story. Instead we leverage Save from Controls to create a new story without writing any code. This also avoids the need for framework-specific code snippets, making the new onboarding framework agnostic.

Screen.Recording.2024-06-21.at.00.30.45.mov

Screen.Recording.2024-06-19.at.21.34.21.mov

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

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[valentinpalkovic]

Can we get rid of the SyntaxHighlighter component? I think it is not needed anymore: https://635781f3500dd2c49e189caf-xengiqztsz.chromatic.com/?path=/story/addons-onboarding-components-syntaxhighlighter--default&globals=theme:dark