fix: Remove deprecated fields from server.properties and update server description.

Author: ChrysanthCow

pack/server.properties

@@ -1,11 +1,7 @@
-motd=Mod Garden: Nature
+motd=Next Garden: Next
 gamemode=adventure
 max-players=99
-enable-command-block=true
 enforce-secure-profile=false
-spawn-npcs=true
-spawn-animals=true
-spawn-monsters=false
 sync-chunk-writes=false
 spawn-protection=0
 white-list=true