docs(index): integrate different program types

* put program type inforamtion into shared.yaml to allow accessing it
  from the index.html.mako template.

Fixes #51

etc/api/shared.yaml

@@ -11,6 +11,15 @@ api:
     # when a resource is supposed to be uploaded
     upload_action: upload
 # Contains values shared among all API implementations
+make:
+  # All known program ids.
+  types:
+    - id: api
+      target_suffix: ''
+      documentation_engine: rustdoc
+    - id: cli
+      target_suffix: -cli
+      documentation_engine: mkdocs
 directories:
   # directory under which all generated sources should reside
   output: gen