chore(suspensive.org): remove unnecessary theme property from _meta.json files

[kangju2000]

Overview

In the development environment, error is occurring

When setting type: 'menu' in Nextra, it is collapsed by default and it does not provide the themes property. so we remove it.

PR Checklist

• [x] I did below actions if need

1. I read the Contributing Guide
2. I added documents and tests.

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[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 01fd94b70ff8c6a640c448bf298bf0186b89d10a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #996 will create unknown performance changes

_{Comparing remove-nextra-error (01fd94b) with main (990058f)}

Summary

:warning: No benchmarks were detected in both the base of the PR and the PR.