Use Kramdown instead of RDiscount

Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'kramdown'

Gemfile.lock

@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    kramdown (1.17.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  kramdown
+
+BUNDLED WITH
+   1.16.2

README.md

@@ -24,7 +24,7 @@ At the top of each file is some attributes — lines that start with a `@` sign.
 
 Files are treated according to their suffixes: `.html` means not to process the text; `.markdown` means to use the Markdown renderer.
 
-(Wildcat requires the RDiscount gem for Markdown rendering.)
+(Wildcat requires the Kramdown gem for Markdown rendering.)
 
 ## Macros
 
@@ -54,4 +54,11 @@ TBD
 
 ## How to run locally
 
-TBD
+Install gem dependencies from `Gemfile`:
+
+```
+gem install bundler
+bundle install
+```
+
+**TBD**

utilities/wildcat_file.rb

@@ -1,7 +1,7 @@
 # Contains the attributes, text, and text type of a file.
 # Could be a page, post, or settings file.
 
-require 'rdiscount'
+require 'kramdown'
 require_relative 'file_parser'
 require_relative '../wildcat_constants'
 
@@ -43,6 +43,15 @@ def text_type_from_path(path)
   end
 
   def render_text
-     @text_type == TEXT_TYPE_MARKDOWN ? RDiscount.new(@text).to_html : @text
+    if @text_type == TEXT_TYPE_MARKDOWN
+      Kramdown::Document.new(
+        @text,
+        input: :kramdown,
+        remove_block_html_tags: false,
+        transliterated_header_ids: true
+      ).to_html
+    else
+      @text
+    end
   end
 end