cmd: add a command to update fcuny.xyz

I'm using fcuny.xyz as a domain to run a number of services on a host
using the IP provided by Tailscale.

Instead of manually updating the DNS configuration in the console every
time I create a new subdomain, let's do this with a small program.

The program query Tailscale API to get the IP address of the host
`tahoe`, and then query the DNS API to see if anything is missing or is
mis-configured. If it's the case, it will resolve the problems.

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