[doc] Refactor links on docs

[skip ci]

ReadMe.md

@@ -1,7 +1,7 @@
 RubyCocoa - A Ruby/Objective-C Bridge
 =====================================
 
-RubyCocoa is a Mac OS X framework that allows Cocoa programming in the
+RubyCocoa is a macOS framework that allows Cocoa programming in the
 object-oriented scripting language [Ruby][1]. In other words, it is a bridge
 that let you access Objective-C objects from Ruby, and vice-versa.
 
@@ -14,9 +14,6 @@ Prerequisites
 - Mac OS X 10.6 or higher
 - Ruby 1.8.7, 2.0 or higher
 
-If you overwrote Apple's Ruby with a custom version, please make sure that it
-has been built with --enabled-shared.
-
 Licensing
 ---------
 
@@ -34,9 +31,9 @@ Contact
 -------
 
 Feel free to report any kind of feedback (bug reports, feature requests, ideas)
-to the [developers mailing-list][2].
+to [the project page on github.com][3].
 
   [1]: http://www.ruby-lang.org/
   [2]: https://www.ruby-lang.org/en/about/license.txt
-  [3]: http://lists.sourceforge.jp/mailman/listinfo/rubycocoa-devel
+  [3]: https://github.com/rubycocoa/rubycocoa
 

doc/index.md

@@ -3,8 +3,8 @@
 RubyCocoa - A Ruby/Objective-C Bridge
 =====================================
 
-RubyCocoa is a framework for [Mac OS X](http://www.apple.com/macosx/)
-that allows [Cocoa](http://developer.apple.com/cocoa/) programming
+RubyCocoa is a framework for [macOS](https://www.apple.com/macos/)
+that allows Cocoa programming
 in the object-oriented scripting language [Ruby](http://www.ruby-lang.org/).
 
 RubyCocoa lets you write a Cocoa application in Ruby. It allows you to create
@@ -16,7 +16,7 @@ Some useful applications of RubyCocoa:
   * Exploration of a Cocoa object's features with `irb` interactively
   * Prototyping of a Cocoa application
   * Writing a Cocoa application that combines good features of Ruby and Objective-C
-  * Wrapping Mac OS X's native GUI for a Ruby script
+  * Wrapping macOS's native GUI for a Ruby script
 
 ## Latest Release
 

doc/resources.md

@@ -18,13 +18,6 @@ Resources
 * [RubyCocoa Ruby API Reference](./OSX.html)
 * [RubyCocoa.framework Objective-C API Reference](./objc/RubyCocoa.html)
 
-## Community
-
-Mailing list:
-
-* [rubycocoa-talk (users)](https://lists.sourceforge.net/lists/listinfo/rubycocoa-talk)
-* [rubycocoa-devel (developers)](http://lists.sourceforge.jp/mailman/listinfo/rubycocoa-devel)
-
 ## Development
 
 * [RubyCocoa projecte site](https://github.com/rubycocoa/rubycocoa) on GitHub.com