Disable Rails cops by default

There was just too much. Some of them seem over the top, while others look like they could be really helpful.
But we don't have time to evaluate them all right now.

.rubocop_rspec_styleguide.yml

@@ -1,4 +1,14 @@
 # OFN styleguide for rubocop-rspec
+# Because there are so many, we will disable by default, and enable rules as needed.
+
+Capybara:
+  Enabled: false
+
+RSpec:
+  Enabled: false
+
+FactoryBot:
+  Enabled: false
 
 RSpec/ExpectChange:
   Enabled: true