integrating dependency article into top-level curation

Author: heckj

Sources/PackageManagerDocs/Documentation.docc/Documentation.md

@@ -15,11 +15,13 @@ The Swift Package Manager leets you share your code as a package, depend on and
 ### Essentials
 
 - <doc:GettingStarted>      <!-- tutorial or article based walk through -->
-- <doc:IntroducingPackages> <!-- content from Documentation/README -->
+- <doc:IntroducingPackages>
 
-<!-- ### Guides -->
+### Guides
 <!-- placeholder location for articles (to be written or copy/updated from existing content -->
 
+- <doc:ExploreDependencies>
+
 <!-- ### Command Plugins -->
 <!-- placeholder for content about swift package manager extensions - command plugins -->
 <!-- - <doc:swift-format> -->