Use a "base" config for Rubocop

.codeclimate.yml

@@ -5,8 +5,6 @@ engines:
     enabled: true
   csslint:
     enabled: true
-  coffeelint:
-    enabled: true
   duplication:
     enabled: true
     config:
@@ -23,6 +21,8 @@ engines:
   rubocop:
     enabled: true
     channel: rubocop-1-56-3
+    config:
+      file: .rubocop.base.yml
 ratings:
   paths:
   - Gemfile.lock

.rubocop.base.yml

@@ -0,0 +1,33 @@
+AllCops:
+  Exclude:
+    - 'bin/**/*'
+    - 'config/**/*'
+    - 'db/**/*'
+  NewCops: enable
+
+Lint/AmbiguousBlockAssociation:
+  Exclude:
+    - 'spec/**/*'
+
+# Relax complexity testing to codeclimate standards (roughly).
+Metrics/AbcSize:
+  Max: 20
+Metrics/MethodLength:
+  Max: 20
+Metrics/ClassLength:
+  Max: 160
+
+Metrics/BlockLength:
+  Exclude:
+    - 'spec/**/*'
+
+# Don't worry about documentation for now.
+# In particular, this fails for things like
+# controller files, which seems unnecessary.
+Style/Documentation:
+  Enabled: false
+
+# I think this cop disagrees with nested calls
+# that are perfectly clear.
+Style/NestedParenthesizedCalls:
+  Enabled: false

.rubocop.yml

@@ -1,43 +1,11 @@
+inherit_from: .rubocop.base.yml
+
 require:
   - rubocop-rails
   - rubocop-rspec
   - rubocop-rspec_rails
   - rubocop-capybara
   - rubocop-factory_bot
 
-AllCops:
-  Exclude:
-    - 'bin/**/*'
-    - 'config/**/*'
-    - 'db/**/*'
-  NewCops: enable
-
-Lint/AmbiguousBlockAssociation:
-  Exclude:
-    - 'spec/**/*'
-
-# Relax complexity testing to codeclimate standards (roughly).
-Metrics/AbcSize:
-  Max: 20
-Metrics/MethodLength:
-  Max: 20
-Metrics/ClassLength:
-  Max: 160
-
-Metrics/BlockLength:
-  Exclude:
-    - 'spec/**/*'
-
 RSpec/NestedGroups:
   Max: 4
-
-# Don't worry about documentation for now.
-# In particular, this fails for things like
-# controller files, which seems unnecessary.
-Style/Documentation:
-  Enabled: false
-
-# I think this cop disagrees with nested calls
-# that are perfectly clear.
-Style/NestedParenthesizedCalls:
-  Enabled: false