aoc: update global leaderboard command and wording for changes in 2025

[onerandomusername]

closes #157

Screenshots of updated embeds:

about

global leaderboard

New changes subcommand:

Input and wording suggestions are greatly appreciated.

[janine9vn]

I went to remove all portions relating to the global leaderboard change command and embed that isn't directly called from the global leader board command. I don't want to maintain that functionality going forward.

Instead there will be new messages in the aoc-faq explaining that change. It will be mentioned in the announcement going out in the next few days and in the 1-3 days before it begins.

I didn't comment on every line that needs to be changed, but you get the idea.

[janine9vn]

Untested on my end, but changes don't look like they'd cripple the bot.

Thank you both for the PR + changes. Will be using a good portion of the original wording in the FAQ channel and will make sure to credit in AoC announcement.