chore: remove intl-segmenter-polyfill

[ota-meshi]

This PR removes intl-segmenter-polyfill.
intl-segmenter-polyfill was used on our site. This is because Intl.Segmenter did not work in FireFox.
However, FireFox now supports Intl.Segmenter, so intl-segmenter-polyfill is no longer needed.

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/125

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[RunDevelopment]

This update has been released 3 days ago. Should we wait a little to give people time to update their browser?

[ota-meshi]

I don't need it right away, so it can wait 👍 Should we wait about a month?

[RunDevelopment]

A month sounds good. The release cycle of Firefox seems to be 4 weeks, so giving people one version as a buffer should be good.