Corrected typo: Install command was missing a space

[DesertCookie]

🔗 Linked issue

Resolves #286.

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Added a space to the install command to turn npx nuximodule add color-mode into nuxi module add color-mode.

Formerly:

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[ratracegrad]

I put in a PR for this same issue since I came across it today. I am approving this PR since it was created before mine. When this PR is merged, you can delete my PR as it is a duplicate. Thanks.