Improved accessibility score

[aakankshabhende]

Issue

This PR focuses on the accessibility score improvement of the site based on LightHouse report. The accessibility is improved from 91 to 95.

It can be further improved by fixing the colour contrast issue but I'm not sure if the new colour will match our brand colour.

Below are the failing elements (k8s features)

Closes: #49298

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: aakankshabhende / name: Aakanksha Bhende (0c75553, a03344f)

[k8s-ci-robot]

Welcome @aakankshabhende!

It looks like this is your first PR to kubernetes/website 🎉. Please refer to our pull request process documentation to help your PR have a smooth ride to approval.

You will be prompted by a bot to use commands during the review process. Do not be afraid to follow the prompts! It is okay to experiment. Here is the bot commands documentation.

You can also check if kubernetes/website has its own contribution guidelines.

You may want to refer to our testing guide if you run into trouble with your tests not passing.

If you are having difficulty getting your pull request seen, please follow the recommended escalation practices. Also, for tips and tricks in the contribution process you may want to read the Kubernetes contributor cheat sheet. We want to make sure your contribution gets all the attention it needs!

Thank you, and welcome to Kubernetes. 😃

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign divya-mohan0209 for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[netlify]

✅ Pull request preview available for checking

Built without sensitive environment variables

Name	Link
🔨 Latest commit	a03344f
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-io-main-staging/deploys/677f5e1bedfbe80008af7d9b
😎 Deploy Preview	https://deploy-preview-49300--kubernetes-io-main-staging.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[sftim]

Some early feedbacl

• Which score does this PR try to improve? It's not obvious from the description.

[sftim]

BTW we use localizable site strings - see https://kubernetes.io/docs/contribute/localization/#site-strings-in-i18n

[aakankshabhende]

Which score does this PR try to improve? It's not obvious from the description.

It focuses on the accessibility score of site based on LightHouse report.
@sftim I'll add a detailed description once the PR is ready for review

[sftim]

/area web-development