new page for the builder dsl

app/views/posts/_2018-04-22-four-years-and-going-strong.haml

@@ -1,6 +1,6 @@
 %p
   After
-  =link_to "finishing the code," , "/blog/a-dynamic-hello-world" 
+  =link_to "finishing the code," , "/blog/a-dynamic-hello-world"
   i updated all the docs too!
 
 %h2 The rewrite
@@ -48,7 +48,7 @@
   But it should definitely be expanded, and there is nothing about Builtin.
   Builtin is the way to write methods that can not be expressed in ruby. And since
   writing them got so messy i wrote a DSL, which is only documented in
-  =link_to "code." , "https://github.com/ruby-x/rubyx/blob/master/lib/risc/builder.rb"
+  =ext_link "code." , "https://github.com/ruby-x/rubyx/blob/master/lib/risc/builder.rb"
 %h3 Calling
 %p
   Since Calling is now done, i documented both the