Merge pull request #2995 from bbc/script-link-storybook

[j-pendlebury]

Resolves #2974

Overall change: Add VisuallyHiddenText to Script Link story.

Psammead story now:

<span>
  <span>Lat</span>
  <span class="VisuallyHiddenText-sc-1yjwwa5-0 jFfEvX">lat</span>
</span>

Simorgh script link:

<span>
  <span aria-hidden="true">Ћир</span>
  <span class="VisuallyHiddenText-sc-1yjwwa5-0 jFfEvX"> Cyrillic </span>
</span>

Code changes:

• Add VisuallyHiddenText to display variant in ScriptLink story.
• package-lock, package.json, and CHANGELOG update

---

• I have assigned myself to this PR and the corresponding issues
• Automated jest tests added (for new features) or updated (for existing features)
• This PR requires manual testing

[DenisHdz]

LGTM