Multi-server automatic leaderboards

This release changes the way the automatic leaderboard module functions, and now takes your config from the /config/servers.json file - the /config/.env file is no longer used for this. If you update to this version, you will have to update your /config/servers.json file according to the example

+ feat: support automatic leaderboard for each server defined in servers.json
+ use dev script instead of start:dev
+ update example servers.json file
+ use global commands instead of test commands
+ conditional TEST_SERVER_GUILD_ID command management, leave it undefined and you'll only have global commands
- remove config from .env
- remove some unused eslint-rule ignores

Full Changelog: v1.1.9...v1.2.0