chore: remove old rubocop file

.rubocop.yml

@@ -1,38 +0,0 @@
----
-AllCops:
-  Exclude:
-    - db/**/*
-    - config/**/*
-    - Vagrantfile
-  TargetRubyVersion: 2.4
-
-Naming/AccessorMethodName:
-  Enabled: false
-
-Lint/RescueWithoutErrorClass:
-  Enabled: false
-
-Metrics/LineLength:
-  Max: 120
-Metrics/CyclomaticComplexity:
-  Enabled: false
-Metrics/PerceivedComplexity:
-  Enabled: false
-Metrics/MethodLength:
-  Enabled: false
-Metrics/BlockLength:
-  Enabled: false
-Metrics/ClassLength:
-  Enabled: false
-Metrics/AbcSize:
-  Enabled: false
-
-Style/NumericLiteralPrefix:
-  Enabled: false
-Style/FrozenStringLiteralComment:
-  Enabled: false
-Style/CommandLiteral:
-  Enabled: true
-  EnforcedStyle: percent_x
-Style/Documentation:
-  Enabled: false