Remove "Testing Nuxt 3" text from markup

[d3jawu]

Fixes

Fixes #4811 by @d3jawu

Description

Removes "Testing Nuxt 3" text hidden in markup.

Testing Instructions

Copy text across header and sub-heading on frontpage. "Testing Nuxt 3" is no longer present.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

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[dhruvkb]

Good find @d3jawu, and thanks for the contribution.

[obulat]

Thank you for the find, and the fix, @d3jawu ✨