add govuk-link style to "View the readme" links on app index page

[gunjam]

Adding missing govuk-link style to the "View the readme" on the app index page.

Preview on Firefox 131.0.3 (macOS)

Before	After

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[oscarduignan]

Hey @gunjam apologies for the slow response to this, thank you very much for the contributions. I've checked with other maintainers and we're going to get your changes integrated. We'll probably create a new PR that combines all your PRs into one release, update/add visual regression tests, and make sure you're attributed

[gunjam]

Cool, lemme know if there's anything I can do to make it easier - rebase them all, cherry-pick them onto the same branch or whatever. Ta.

[JoPintoPaul]

Hi @gunjam , we're preparing your PRs as a single new release of hmrc-frontend now. Can you let me know your full name + Government department so we can credit you correctly in the release notes? Many thanks.

[gunjam]

Hey, just including my @ will be fine, ta.