Add MooseDocs content keys to enable explicit auto linking

refs #350

Author: loganharbour

doc/config.yml

@@ -1,15 +1,25 @@
 Content:
-    - ${ROOT_DIR}/assessment
-    - ${ROOT_DIR}/doc/content
-    - ${MOOSE_DIR}/framework/doc/content
-    - ${MOOSE_DIR}/modules/contact/doc/content
-    - ${MOOSE_DIR}/modules/heat_conduction/doc/content
-    - ${MOOSE_DIR}/modules/misc/doc/content
-    - ${MOOSE_DIR}/modules/tensor_mechanics/doc/content
-    - ${MOOSE_DIR}/modules/xfem/doc/content
-    - ${MOOSE_DIR}/modules/stochastic_tools/doc/content
-    - ${MOOSE_DIR}/modules/ray_tracing/doc/content
-    - infrastructure:
+    blackbear_assessment:
+        root_dir: ${ROOT_DIR}/assessment
+    blackbear:
+        root_dir: ${ROOT_DIR}/doc/content
+    framework:
+        root_dir: ${MOOSE_DIR}/framework/doc/content
+    contact:
+        root_dir: ${MOOSE_DIR}/modules/contact/doc/content
+    heat_conduction:
+        root_dir: ${MOOSE_DIR}/modules/heat_conduction/doc/content
+    misc:
+        root_dir: ${MOOSE_DIR}/modules/misc/doc/content
+    tensor_mechanics:
+        root_dir: ${MOOSE_DIR}/modules/tensor_mechanics/doc/content
+    xfem:
+        root_dir: ${MOOSE_DIR}/modules/xfem/doc/content
+    stochastic_tools:
+        root_dir: ${MOOSE_DIR}/modules/stochastic_tools/doc/content
+    ray_tracing:
+        root_dir: ${MOOSE_DIR}/modules/ray_tracing/doc/content
+    modules:
         root_dir: ${MOOSE_DIR}/modules/doc/content
         content:
             - help/finite_element_concepts/nodal_patch_recovery.md