Add DNS.Watch servers to web admin

[PromoFaux]

By submitting this pull request, I confirm the following (please check boxes, eg [X])Failure to fill the template will close your PR:

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• 10 (very familiar)

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As seen pi-hole/pi-hole#1253

This template was created based on the work of udemy-dl.

[nnt0]

Thanks, i didn't thought of that.

[PromoFaux]

:) Only occurred to me this afternoon!

[dschaper]

Approved