Fix: rm countdown redirect

[katspaugh]

What it solves

Removes the redirect to the new app, and instead links to the help article on AB export.

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[iamacook]

We should make a mental note to remove the search parameter from web-core as well.

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[coveralls]

Pull Request Test Coverage Report for Build 3426265110

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 41.9%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/components/PsaBanner/index.tsx	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/components/PsaBanner/index.tsx	2	0%

Totals
Change from base Build 3419449924:	0.1%
Covered Lines:	4777
Relevant Lines:	10407

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💛 - Coveralls