Update names lecture content and TOC

Author: Zahra-khanzadeh

lectures/_toc.yml

@@ -10,7 +10,7 @@ parts:
   - file: functions
   - file: python_essentials
   - file: oop_intro
-  # - file: names
+  - file: names
   # - file: python_oop
   # - file: workspace 
 # - caption: The Scientific Libraries