feat: add threat.is-a.dev domain

[xkbm]

Domain

• Domain: threat.is-a.dev
• Owner GitHub: xkbm
• DNS Record: CNAME → cname.vercel-dns.com (Vercel hosting)

Deployed via Vercel (threat-bot-discord project).

[is-a-dev-reviewbot]

Hi there! 👋

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2. Check if the filename, file format, and records are valid. If you don't know if it's valid, please read this part of the documentation and use a JSON validator/formatter, like jsonlint. Make sure that the file is in the domains directory and not somewhere else in the repository.
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[is-a-dev-reviewbot]

Invalid Pull Request

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Incomplete PR

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