bigsky: show something helpful when you hit home route (#793)

bgs/bgs.go

@@ -349,6 +349,7 @@ func (bgs *BGS) StartWithListener(listen net.Listener) error {
 	e.GET("/xrpc/com.atproto.sync.notifyOfUpdate", bgs.HandleComAtprotoSyncNotifyOfUpdate)
 	e.GET("/xrpc/_health", bgs.HandleHealthCheck)
 	e.GET("/_health", bgs.HandleHealthCheck)
+	e.GET("/", bgs.HandleHomeMessage)
 
 	admin := e.Group("/admin", bgs.checkAdminAuth)
 
@@ -420,6 +421,23 @@ func (bgs *BGS) HandleHealthCheck(c echo.Context) error {
 	}
 }
 
+var homeMessage string = `
+d8888b. d888888b  d888b  .d8888. db   dD db    db
+88  '8D   '88'   88' Y8b 88'  YP 88 ,8P' '8b  d8'
+88oooY'    88    88      '8bo.   88,8P    '8bd8'
+88~~~b.    88    88  ooo   'Y8b. 88'8b      88
+88   8D   .88.   88. ~8~ db   8D 88 '88.    88
+Y8888P' Y888888P  Y888P  '8888Y' YP   YD    YP
+
+This is an atproto [https://atproto.com] relay instance, running the 'bigsky' codebase [https://github.com/bluesky-social/indigo]
+
+The firehose WebSocket path is at:  /xrpc/com.atproto.sync.subscribeRepos
+`
+
+func (bgs *BGS) HandleHomeMessage(c echo.Context) error {
+	return c.String(http.StatusOK, homeMessage)
+}
+
 type AuthToken struct {
 	gorm.Model
 	Token string `gorm:"index"`