Replace Dyno server logging

[pushiscool]

Added Task 5.

• Replaced the old delete-only logger with a full server_log cog.
• Logs message deletes/edits, bulk deletes, joins/leaves/kicks, bans/unbans, member role/nick/timeout changes, voice events, channel/thread/role/server updates, invites, emojis, and stickers.
• Loads cogs.server_log instead of cogs.delete_log.
• Added server_log_channel config documentation.
• Includes the CI fix for missing configured mod role IDs.