_config.yml: Remove nav_links and footer_content, tidy-up aux_links

_config.yml

@@ -28,18 +28,12 @@ search_enabled: true
 heading_anchors: true
 permalink: pretty
 nav_links:
-  Okpy:
-    - 'https://okpy.org'
-  Gradescope:
-    - 'https://gradescope.com'
-  Piazza:
-    - 'https://piazza.com'
 aux_links:
-  'Kevin Lin':
+  Kevin Lin:
     - 'https://kevinl.info'
-  'Just the Class on GitHub':
+  Just the Class on GitHub:
     - 'https://github.com/kevinlin1/just-the-class'
-footer_content: "Based on <a href=\"https://github.com/pmarsceill/just-the-docs\">Just the Docs</a> by Patrick Marsceill."
+footer_content:
 
 # Collections for website data
 collections: