Update CK to 0.31 everywhere

Summary: Thisi diff updates the CK version to > 0.31 everywhere. It also removes direct CK dependency on SampleSwift, as it doesn't use CK directly.

Reviewed By: fabiomassimo

Differential Revision: D28898898

fbshipit-source-id: 77d4cece79a0a4a51e7ac27b3ec68283740cd0b2

docs/getting-started/ios-native.mdx

@@ -40,7 +40,7 @@ target 'MyApp' do
   pod 'CocoaAsyncSocket', :configuration => 'Debug'
   # ...except, of course, those transitive dependencies that your
   # application itself depends, e.g.:
-  pod 'ComponentKit', '~> 0.30'
+  pod 'ComponentKit', '~> 0.31'
 
   # If you use `use_frameworks!` in your Podfile,
   # uncomment the below $static_framework array and also