- relocate coding-style and page-code-development to sub-directory

coding/patterns/selectors.md

 <!-- --- title: OpenFOAM C++ Coding Patterns (selectors) -->
 
-[Back to _coding patterns_](/coding/patterns/patterns)
+[![home](/icons/home.svg "wiki home")](/home)
+[![code](/icons/code.svg "coding patterns")][code-patterns]
 
 ***We are happy to incorporate content from volunteers!!***
 
@@ -58,3 +59,5 @@ FatalIOErrorInFunction(dict)
 ----
 
 Copyright (C) 2019 OpenCFD Ltd.
+
+[code-patterns]: /coding/patterns/patterns