Fix order

Author: woojiahao

docs/architecture/index.md

@@ -1,4 +1,4 @@
 ---
 title: Architecture
-nav_order: 4
+nav_order: 3
 ---

docs/libraries/index.md

@@ -1,10 +1,10 @@
 ---
 title: Libraries
-nav_order: 3
+nav_order: 4
 ---
 
 Git-Mastery publishes and maintains several public packages:
 
-- `repo-smith`
-- `git-autograder`
-- `difflib-parser`
+- [`repo-smith`](https://github.com/git-mastery/repo-smith)
+- [`git-autograder`](https://github.com/git-mastery/git-autograder)
+- [`difflib-parser`](https://github.com/git-mastery/difflib-parser)