Don't load commands if env variable doesn't exist, removed catfact/dogfact, many other changes

.env.example

@@ -1,8 +1,18 @@
-# Put MongoDB database URL here
-MONGO=
+###########
+# Required
+###########
 
 # Put Discord token here
 TOKEN=
+# Put MongoDB database URL here
+MONGO=mongodb://localhost:27017/esmBot
+# Put snowflake ID of bot owner here
+OWNER=
+
+###########
+# Optional
+###########
+
 # Put Cat API token here
 CAT=
 # Put Mashape/RapidAPI key here
@@ -14,5 +24,12 @@ CSE=
 # Put DBL/top.gg token here
 DBL=
 
-# Put snowflake ID of bot owner here
-OWNER=
+# Enable/disable Twitter bot (true/false)
+TWITTER=false
+# Put Twitter username here
+HANDLE=
+# Put consumer key, consumer secret, access token, and access secret here
+TWITTER_KEY=
+CONSUMER_SECRET=
+ACCESS_TOKEN=
+ACCESS_SECRET=