chore: Update the design of the help center portal (#6775)

Gemfile.lock

@@ -643,6 +643,11 @@ GEM
       sexp_processor (~> 4.6)
     ruby_parser (3.20.0)
       sexp_processor (~> 4.16)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
@@ -653,6 +658,8 @@ GEM
       tilt
     scout_apm (5.3.3)
       parser
+    scss_lint (0.60.0)
+      sass (~> 3.5, >= 3.5.5)
     seed_dump (3.3.1)
       activerecord (>= 4)
       activesupport (>= 4)
@@ -874,6 +881,7 @@ DEPENDENCIES
   rubocop-rails
   rubocop-rspec
   scout_apm
+  scss_lint
   seed_dump
   sentry-rails
   sentry-ruby