[Bug]: 2 letters domains are not supported

[stncrn]

Environment

domain-locker.com (managed instance)

Version

demo

Describe the Issue

Hello,

I decided to try the demo before installing the app in Docker.
And I found an issue with one and two letters domains, allowed by some registries, for example: ta.ma, a.fr, hp.com
(.ma allows 2+ letters, .fr allows 1+ letters, .com now allows 3+ letters, but choosed to not revoke 1 and 2 letters domains registered earlier)

The Add Domain form just considers these domains as invalid: " Please enter a valid domain name."

The root cause lies here :

domain-locker/src/app/pages/domains/add/index.page.ts

Line 95 in 51ce35f

Validators.pattern(/^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9](\.[a-zA-Z]{2,})+$/),

The regex /^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9](\.[a-zA-Z]{2,})+$/ should be replaced by a more robust one.

Some googling led me to : ^(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z]{2,63}$
Which also handles properly other cases that yours misses. (examples from https://regexr.com/8hlkq vs https://regexr.com/8hlkt)

It still isn't perfect however, as it doesn't handles unicode tlds (as .网‍站), even in their punycode form (xn--5tzm5g)
(official full list of TLDs available here : https://data.iana.org/TLD/tlds-alpha-by-domain.txt)
Punycoded domains are properly handled though, for example http://xn--itacos-i50d.ws/ (punycode of http://i❤️tacos.ws)

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