Implement UX feedback on access link sidebar

[jazairi]

Why these changes are being introduced:

UXWS has requested some changes to the access link sidebar (and the full record view more broadly).

Relevant ticket(s):

• GDT-319

How this addresses that need:

• Changes aria-label for the sidebar;
• Updates heading typography to match the filter sidebar heading; and
• Adds top margin to the full record.

Side effects of this change:

None.

Developer

Accessibility

• ANDI or WAVE has been run in accordance to our guide.
• This PR contains no changes to the view layer.
• New issues flagged by ANDI or WAVE have been resolved.
• New issues flagged by ANDI or WAVE have been ticketed (link in the Pull Request details above).
• No new accessibility issues have been flagged.

New ENV

• All new ENV is documented in README.
• All new ENV has been added to Heroku Pipeline, Staging and Prod.
• ENV has not changed.

Approval beyond code review

• UXWS/stakeholder approval has been confirmed.
• UXWS/stakeholder review will be completed retroactively.
• UXWS/stakeholder review is not needed.

Additional context needed to review

UXWS will confirm that it looks the way they want it to, so this review is just to confirm the HTML/CSS changes are valid.

Code Reviewer

Code

• I have confirmed that the code works as intended.
• Any CodeClimate issues have been fixed or confirmed as
  added technical debt.

Documentation

• The commit message is clear and follows our guidelines
  (not just this pull request message).
• The documentation has been updated or is unnecessary.
• New dependencies are appropriate or there were no changes.

Testing

• There are appropriate tests covering any new functionality.
• No additional test coverage is required.

[coveralls]

Pull Request Test Coverage Report for Build 9083065244

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 98.632%

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Totals
Change from base Build 9037528205:	0.2%
Covered Lines:	577
Relevant Lines:	585

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💛 - Coveralls