Add Subdomains blacklist

[AmoabaKelvin]

Due to some of the services being used, it might be an issue when some subdomains are used, as such, to prevent those issues from arising, a list of problematic subdomains have been added that ensure that users do not create links with them

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Name	Status	Preview	Updated (UTC)
ishortn-ink	✅ Ready (Inspect)	Visit Preview	Dec 6, 2023 10:50pm

[what-the-diff[bot]]

PR Summary

• Added a new constant defining subdomains that are not allowed A new constant specifying which subdomains users are not permitted to use has been added to a file where we keep all such constants.

• Updated Dynamic Links Form

  • The disallowed subdomains constant is imported into the file that handles the form for creating dynamic links.
  • A new rule has been added to the form's validation that prevents the use of the disallowed subdomains.
  • An enhancement has been made so that the form's validation process will be skipped if there are already errors present in the form.

• Temporarily Commented Out Code in Link Edit Form A certain section of the code in the form that is used to edit links has been temporarily commented out. This section will be re-enabled in the future when necessary.