fix: update graduate count

[Sushanth012]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Closes freeCodeCamp/freeCodeCamp#68614

Summary

• Updates Open Graph and Twitter description metadata from 40,000 graduates to 100,000 graduates.
• Keeps the CDN metadata aligned with the site copy requested in 100K graduates for site adverts freeCodeCamp#68614.

Testing

• Confirmed no remaining 40,000 graduates references in HTML metadata.
• Ran git diff --check.

Companion to freeCodeCamp/freeCodeCamp#68730.

[majestic-owl448]

Thank you for the contribution!

Please help add back the following template to the PR description, and follow the checklist. Until then, we are not able to review this PR.

Checklist:

<!-- Please follow this checklist and put an x in each of the boxes, like this: [x]. It will ensure that our team takes your pull request seriously. -->

- [ ] I have read [freeCodeCamp's contribution guidelines](https://contribute.freecodecamp.org).
- [ ] My pull request has a [descriptive title](https://contribute.freecodecamp.org/#/how-to-open-a-pull-request?id=prepare-a-good-pr-title) (**not** a vague title like `Update index.md`)

<!--If your pull request closes a GitHub issue, replace the XXXXX below with the issue number.-->

Closes #XXXXX

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[Sushanth012]

Updated the PR description with the requested template, completed both checklist items, and linked the originating issue as Closes freeCodeCamp/freeCodeCamp#68614. Thank you for pointing this out.

[majestic-owl448]

[x] My pull request has a descriptive title (not a vague title like Update index.md)

please double check this, and update the title of your PR

[Sushanth012]

Updated the PR title to ix: update graduate count so it follows freeCodeCamp's Conventional Commit title format and remains concise and descriptive. I also rechecked the completed title checklist item.

[Sushanth012]

Correction: the PR title is now fix: update graduate count. It follows the required Conventional Commit format and is concise and descriptive.

[majestic-owl448]

Hi @Sushanth012. Congrats on your first pull request (PR)! 🎉

Thank you for your contribution to the page! 👍
We are happy to accept these changes and look forward to future contributions. 📝