Add Void difficulty and publish changelogs

docs/changelogs.md

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+# Release changelogs
+
+`/changelogs` reads messages from MineGeo's `___news___` channel (`1558048830770122772`).
+Only release posts from webhook ID `1561021045211660401` appear. The bot only reads
+message history using GET; this feature never sends, edits, or deletes Discord messages.
+The webhook URL and its secret token are not needed or stored by the reader.
+
+Use the existing server-only `DISCORD_BOT_TOKEN` with View Channel and Read Message
+History in news. Enable Message Content Intent in Discord Developer Portal → Bot;
+otherwise Discord redacts the webhook messages' text. Optional `DISCORD_NEWS_CHANNEL_ID` and `DISCORD_RELEASE_WEBHOOK_ID`
+override the defaults. Never prefix these variables with `NEXT_PUBLIC_`.
+
+The feed accepts `## MineGeo 1.0.4 Alpha`, `Beta`, `Production`, and four-part
+`Bug fix` headings. It removes role mentions, leading separators, and the trailing
+`PLAY THE MINEGEO AT:` footer. React safely renders paragraphs, bullet lists, bold,
+inline code, and HTTP(S) links; raw HTML cannot execute.
+
+Discord history is cached for 60 seconds. The latest page refreshes every 65 seconds
+while visible. Each page scans 100 Discord messages; Older posts continues through
+history even when a page contains only tournament announcements. Edited and deleted
+release posts are reflected after revalidation. If credentials or history permissions
+are unavailable, the page displays a temporary-unavailability state, without exposing
+Discord errors or credentials. There is no database migration for changelogs.