Removes hero and thumbnail images for the economic times case study.

[malchata]

Changes proposed in this pull request:

• Removes incorrect hero and thumbnail images for the Economic Times case study.

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[chrome-devrel-review-bot]

Hello! This is an automated review by our custom reviewbot. It updates automatically when code or GitHub comments in this pull request are created or updated.

Requested changes

If there are any common problems with the content files you created or modified, they will be listed here.

src/site/content/en/blog/economic-times-cwv/index.md

• This file passed all of our automated Markdown audits.