bot-info mem usage

Added mem usage for all shards to bot-info command. Also removed
bigdecimal from gemfile as I was a bit hasty here and it threw errors on
the server

Gemfile

@@ -1,7 +1,6 @@
 source 'https://rubygems.org'
 
 gem 'base64'
-gem 'bigdecimal', '~> 1.2', '>= 1.2.7'
 gem 'dicebag', git: 'https://github.com/Humblemonk/Dice-Bag.git', branch: 'pre-3.3'
 gem 'discordrb', github: 'shardlab/discordrb', branch: 'main'
 gem 'dotenv', '~> 2.5'

src/dice_maiden_logic.rb

@@ -539,7 +539,8 @@ def check_bot_info(event)
     servers = $db.execute 'select sum(server_count) from shard_stats;'
     shards = $db.execute 'select sum(shard_id) from shard_stats;'
     total_shards = shards.join.to_i + 1
-    event.respond(content: "| Dice Maiden | - #{servers.join.to_i} active servers across #{total_shards} shards")
+    total_mem = $db.execute 'select sum(mem) from shard_stats;'
+    event.respond(content: "| Dice Maiden | - #{servers.join.to_i} active servers across #{total_shards} shards using #{total_mem.join.to_i.round / 1024}GB of ram")
     true
   end
 end