Add no index to site

[rphovley]

The Pull Request is ready

• [x] all github actions are passing
• [x] are changes backwards compatible?
• [x] fixes #0
• [x] the branch follows the naming schema issue-123-enable-x-does-not-disable-y
• [x] the pull request has a sensible title

Intention

• [x] the code is readable
• [x] issues for follow-up tasks have been created
• [x] there is no any type used

Notes

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit db45daa):

https://codeclimbersio--pr229-issue-0-index-8lcbyhrm.web.app

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