Implement accessibility improvements to the website

[kellylee-gds]

Brief

By the end of this brief, we should achieved the following:

• ship improvements to search results to improve the experience of screen reader users
• fix or adjust link text issues identified in the content audit
• update our accessibility strategy to include information on how we deal with bugs in 3rd party software

We should also consider publicly documenting our decision making rationale regarding these changes on the community backlog or GitHub discussions.

Epic lead

Owen

Driving role(s)

Hazal, Calvin, Anika

Supporting roles

Kelly

### Tasks
- [ ] https://github.com/alphagov/govuk-design-system/issues/4195
- [ ] https://github.com/alphagov/govuk-design-system/issues/4194
- [ ] Which squad is doing the details fix, if DAC like it? Probably us but need to talk to beeps and Char
- [ ] https://github.com/alphagov/govuk-design-system/issues/4267
- [ ] https://github.com/alphagov/design-system-team-internal/issues/918
- [ ] https://github.com/alphagov/govuk-design-system/issues/4269
- [ ] For post-cycle: feed remaining audit issues to the leads (thread in slack about this on hover states)

### Stretch goals
- [ ] https://github.com/alphagov/govuk-design-system/issues/4268
- [ ] https://github.com/alphagov/govuk-design-system/issues/4270
- [ ] https://github.com/alphagov/govuk-frontend/issues/5448
- [ ] https://github.com/alphagov/govuk-design-system/issues/4271

[kellylee-gds]

It's looking likely that the File upload & Details brief will be paused this cycle due to the squad member's capacity. We still want to review DAC's feedback if it's received this cycle and make a decision on how to proceed. We'll then assess whether we think we have time / capacity to build the production code for Details and / or create the browser extension for Dragon.