replace redcarpet (no longer supported) with kramdown (jekyll default markdown parser)

Author: 0xdevalias

Gemfile

@@ -1,7 +1,6 @@
 source 'https://rubygems.org'
 
 gem 'jekyll','~>4.1.0'
-gem 'redcarpet'
 
 # LSI (related posts)
 # Note: You need to install one of nmatrix or narray first, and export NMATRIX=1 or NARRAY=1 before running bundle install

Gemfile.lock

@@ -94,7 +94,6 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    redcarpet (3.5.0)
     rexml (3.2.4)
     rouge (3.21.0)
     safe_yaml (1.0.5)
@@ -140,7 +139,6 @@ DEPENDENCIES
   jekyll-twitter-plugin
   jekyll_version_plugin
   nmatrix
-  redcarpet
 
 BUNDLED WITH
    2.1.4

_config.yml

@@ -75,16 +75,15 @@ defaults:
       class: "post-template"
       navigation: True
 
-# Conversion
-markdown: redcarpet
-redcarpet:
-  extensions:
-    - "tables"
-    - "autolink"
-    - "strikethrough"
-    - "space_after_headers"
-    #- "with_toc_data"
-    - "fenced_code_blocks"
+# Markdown
+#   https://jekyllrb.com/docs/configuration/markdown/
+#   https://kramdown.gettalong.org/options.html
+
+kramdown:
+  input: GFM
+  smart_quotes: apos,apos,quot,quot
+  show_warnings: true
+
 lsi: false # Index for related posts (enabled by command line)
 
 keep_files: