chore(showcase): Add OnTravelDiary to list of sites (#25247)
chore(showcase): Add OnTravelDiary to list of sites (#25247)

* chore(sites): Add OnTravelDiary to list of sites

* chore: format

* Update docs/sites.yml

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Co-authored-by: Marcy Sutton <63f38fb7a2c9e72439a06d93cefb66621e8fc496@gatsbyjs.com>
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