Add MineGeo gameplay systems and interface

docs/vercel-deployment.md

@@ -1,5 +1,23 @@
 # Deploy MineGeo
 
+Optional Discord map and multiplayer-party announcements use `DISCORD_BOT_TOKEN`,
+`DISCORD_MAPS_CHANNEL_ID`, and `DISCORD_PARTIES_CHANNEL_ID`. All published parties
+use the same configured channel. Follow [Discord bot setup](discord-integration.md)
+for creation, permissions, Vercel variables, and retries. Apply the Discord queue
+migration before deploying this feature; the bot token stays server-only.
+
+Optional community buttons appear in the footer when `MINEGEO_DISCORD_URL` or
+`MINEGEO_TELEGRAM_URL` is configured. Set these public links in `.env.local` for
+local development (ordinary `.env` also works). Restart the local server after
+changing a link. For the hosted site, add the same names as Production Config
+variables in the MineGeo Vercel project, then redeploy. These values are public
+destinations; no Discord bot token or Telegram API key is needed.
+
+Discord accepts HTTPS links on `discord.gg`, `discord.com`, `www.discord.com`,
+and `discordapp.com`. Telegram accepts `t.me` and `telegram.me`, including group
+invite links. Blank, malformed, or unsupported URLs hide the corresponding
+button. Each button opens its configured destination in a new tab.
+
 Run `npm run deploy` from the project directory. The script collects all web
 source files and public assets, uploads them in one request, waits for the build,
 and prints the deployment URL. It uses the [Vercel deployments API](https://vercel.com/docs/rest-api/deployments/create-a-new-deployment). The database credentials already configured in