fix: Skip link stylings

What is it?

• Fix: Skip link is styled like other links with focus state
• Fix: Stopped skip link causing page to jump
• Fix: site title not being vertically aligned in header
• Chore: fixed references to templates in storybook containing unnecessary ../

What impact will there be?

Minimal.

What actions do I need to take?

• Test on Drupal instance that skip link behaves as expected.
• Verify site title text is vertically aligned.

Are there any risks I should be aware of?

No.