fixed jekyll for ruby 3

main/Gemfile

@@ -5,3 +5,4 @@ source "https://rubygems.org"
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 gem "jekyll"
+gem "webrick"

main/Gemfile.lock

@@ -3,7 +3,6 @@ GEM
   specs:
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
-    coderay (1.1.3)
     colorator (1.1.0)
     concurrent-ruby (1.1.9)
     em-websocket (0.5.2)
@@ -38,9 +37,6 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    kramdown-syntax-coderay (1.0.1)
-      coderay (~> 1.1)
-      kramdown (~> 2.0)
     liquid (4.0.3)
     listen (3.5.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -60,13 +56,14 @@ GEM
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     unicode-display_width (1.7.0)
+    webrick (1.7.0)
 
 PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
   jekyll
-  kramdown-syntax-coderay
+  webrick
 
 BUNDLED WITH
    2.2.22