Use only production deployments by default

[qurle]

Hi Artur, By default you use show the status of the last deployment. If it’s a failed preview, that’s usually okay for the project.

In this PR I excluded preview deployments from the badge by default. Now the badge show status of the last production deployment. I also added and documented query parameter to include preview developments.

Example Failed preview: https://badge.qurle.net/api/qurle/vercel-badge?previews=true

Okay production: https://badge.qurle.net/api/qurle/vercel-badge

[vercel[bot]]

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