Rubocop: Group cops by type

This decreases the risk of adding a rule twice, and makes things easier
to find

.rubocop.yml

@@ -30,30 +30,9 @@ Metrics/CyclomaticComplexity:
 Metrics/PerceivedComplexity:
   Enabled: false
 
-Style/StructInheritance:
-  Enabled: false
-
 Layout/AlignParameters:
   EnforcedStyle: with_fixed_indentation
 
-Style/StringLiterals:
-  EnforcedStyle: double_quotes
-
-Style/StringLiteralsInInterpolation:
-  EnforcedStyle: double_quotes
-
-Style/AndOr:
-  Enabled: false
-
-Style/Not:
-  Enabled: false
-
-Style/FrozenStringLiteralComment:
-  Enabled: true
-
-Documentation:
-  Enabled: false # TODO: Enable again once we have more docs
-
 Layout/CaseIndentation:
   EnforcedStyle: case
   SupportedStyles:
@@ -61,16 +40,37 @@ Layout/CaseIndentation:
     - end
   IndentOneStep: true
 
-Style/PercentLiteralDelimiters:
-  PreferredDelimiters:
-    '%w': "[]"
-    '%W': "[]"
-
 Layout/AccessModifierIndentation:
   EnforcedStyle: outdent
 
 Layout/EndAlignment:
   EnforcedStyleAlignWith: variable
 
+Style/FrozenStringLiteralComment:
+  Enabled: true
+
+Style/PercentLiteralDelimiters:
+  PreferredDelimiters:
+    '%w': "[]"
+    '%W': "[]"
+
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+Style/StringLiteralsInInterpolation:
+  EnforcedStyle: double_quotes
+
+Style/StructInheritance:
+  Enabled: false
+
+Style/AndOr:
+  Enabled: false
+
+Style/Not:
+  Enabled: false
+
 Style/DoubleNegation:
   Enabled: false
+
+Documentation:
+  Enabled: false # TODO: Enable again once we have more docs