Add navigation macros file with first rough stab at a site nav generator
Add navigation macros file with first rough stab at a site nav generator

prontotype/prontotype-LEGACY,prontotype/prontotype-LEGACY,prontotype/core-LEGACY,prontotype/core-LEGACY,ThatGuyCND/D8-Twig-Prototype,ThatGuyCND/D8-Twig-Prototype,ThatGuyCND/D8-Twig-Prototype