Update docs

[Parsium]

Proposed behaviour

• Update Getting Started guide to reference TokensWrapper, to illsutrate how to load the new Fusion token set
• Fix AdvancedColorPicker and SplitButton interaction stories showing publicly

Current behaviour

• Getting started guide doesn't reference the recently added TokensWrapper
• Interaction stories for AdvancedColorPicker and SplitButton are visible publicly

Checklist

• Commits follow our style guide
• Related issues linked in commit messages if required
• Screenshots are included in the PR if useful
• All themes are supported if required
• Unit tests added or updated if required
• Playwright automation tests added or updated if required
• Storybook added or updated if required
• Translations added or updated (including creating or amending translation keys table in storybook) if required
• Typescript d.ts file added or updated if required
• Related docs have been updated if required

QA

• Tested in provided StackBlitz sandbox/Storybook
• Add new Playwright test coverage if required
• Carbon implementation matches Design System/designs
• UI Tests GitHub check reviewed if required

Testing instructions

Several story titles and story filenames have been modified, so some Chromatic changes may arise. However, no changes have been made to either component code or story content.