GET RID OF SASSC

Author: wenyikuang

server/Gemfile

@@ -53,10 +53,10 @@ gem 'daemons', '~> 1.3.1'
 # Gems used only for assets and not required
 # in production environments by default.
 gem 'twitter-bootstrap-rails', '~> 5.0.0'
-gem 'bootstrap-sass', '~> 3.4.1'
+gem 'postcss-rails', '~> 2.0.0'
+gem 'autoprefixer-rails', '~> 10.4.7'
+gem 'bootstrap', '~> 5.2.0' # Modern Bootstrap without Sass dependency
 gem 'coffee-rails', '~> 5.0.0'
-gem 'sass', '~> 3.7.4'
-gem 'sass-rails', '~> 6.0.0'
 gem 'sprockets-rails', '~> 3.2.2'
 gem 'uglifier', '~> 4.2.0'
 # mail => 2.8.0 has startup failures with rails 6.1.x series
@@ -69,9 +69,6 @@ gem 'net-imap', '~> 0.4.10'
 gem 'date', '~> 3.3.4'
 # don't try to install sassc 2.
 gem 'roo', '~> 2.8.3'
-gem 'sassc', '~> 2.4.0'
-gem 'concurrent-ruby', '1.3.4'
-
 # For workers - and other dependencies for measures
 ## Commonly update gems for testing and development