Use Discord bot to avoid duplicate daily messages

[ghost]

At the moment the app uses a webhook to post the messages. This leads to lots of spam if a given country's stats change multiple times daily.

I want to use a Discord bot to post messages instead, and edit them when that day's stats change. This requires a few things, off the top of my head:

• Integrating with a custom bot that allows posting and editing posts
• Saving post IDs in the JSON database
• Refactoring "postToDiscord" to check if an ID exists for a given date, and modify the message if so
• Add mechanism to save message ID to the JSON database