Adds link to source code of current module

Author: denizzzka

dpl-docs/views/layout.dt

@@ -201,6 +201,11 @@ html(lang='en-US')
                 | Bugzilla issue.
 
             - if( modname )
+              .tip.smallprint
+                a(href='https://github.com/dlang/#{project}/blob/master/#{path_prefix}#{filename}#{line_suffix}')
+                  | Source
+                div
+                  | Source code of this page
               .tip.smallprint
                 a(href='https://github.com/dlang/#{project}/edit/master/#{path_prefix}#{filename}#{line_suffix}')
                   | Improve this page