went through week 3 slides to check against readings

Updated some stylistic things and added room for captions

_data/navigation.yml

@@ -6,13 +6,5 @@ nav_list:
   url: /schedule.html
 - title: Assignments
   url: /assignments/
-- title: Canvas
-  url: canvas
-- title: Ed
-  url: discussion
-- title: COVID-19
-  url: /docs/covid/index.html
-- title: Accessibility
-  url: /docs/accessibility.html
 - title: Academic Conduct
   url: /academic-conduct.html
\ No newline at end of file