Discord webhooks now use discordapp.com rather then discord.com

Creating new webhooks in not working correctly anymore, since Discord now uses the 'discordapp.com' domain, instead of discord.com for webhooks. Because you do a hard check for the existance of discord.com in the url, I'm unable to register new webhooks. See: https://github.com/Commit451/skyhook-web/blob/main/lib/skyhook_home_page.dart#L68