feat: remove askbot changes in depr216 (#33408)

* feat: remove askbot changes in depr216

* feat: update cms test.py

* feat: update cms test.py

cms/envs/test.py

@@ -142,8 +142,7 @@ COURSE_AUTHORING_MICROFRONTEND_URL = "http://course-authoring-mfe"
 DISCUSSIONS_MICROFRONTEND_URL = "http://discussions-mfe"
 
 CACHES = {
-    # This is the cache used for most things. Askbot will not work without a
-    # functioning cache -- it relies on caching to load its settings in places.
+    # This is the cache used for most things.
     # In staging/prod envs, the sessions also live here.
     'default': {
         'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',

lms/static/sass/course/base/_extends.scss

@@ -30,7 +30,7 @@ h1.top-header {
 }
 
 .light-button,
-a.light-button, // only used in askbot as classes
+a.light-button,
 .gray-button {
   @include simple($gray-l5);