Website generation: Fix missing gems

Author: szh

docs/Gemfile

@@ -37,3 +37,7 @@ gem 'jekyll-redirect-from'
 gem 'kramdown', '>= 2.3.0'
 
 gem 'webrick', '~> 1.7'
+
+gem 'csv'
+gem 'base64'
+gem 'bigdecimal'

docs/Gemfile.lock

@@ -3,8 +3,11 @@ GEM
   specs:
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.9)
     colorator (1.1.0)
     concurrent-ruby (1.2.3)
+    csv (3.3.2)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
@@ -76,6 +79,9 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  base64
+  bigdecimal
+  csv
   jekyll (~> 4.3.3)
   jekyll-feed (~> 0.17)
   jekyll-redirect-from