Add ban appeal form to FAQ (#78)

docs/faq.mdx

@@ -318,3 +318,7 @@ To disable these messages configure the following in config.yml: [`ServerWatchDo
 ### Why can't I message the bot? {#why-cant-i-message-the-bot}
 
 Make sure that you have direct messages enabled on the server that you share with the bot. This should allow you to send it a private message. If that doesn't work, [check this article](https://support.discord.com/hc/en-gb/articles/360060145013).
+
+### I got banned from your Discord server. How can I appeal?
+
+You can appeal a ban from our Discord server using [this form](https://discordsrv.com/discord/ban-appeal).