doc: add download page (#1470)

Author: erisu

Gemfile

@@ -1,3 +1,4 @@
 source 'https://rubygems.org'
 gem 'jekyll', '~> 4.2'
-gem 'rouge', '~> 3.26'
+gem 'rouge', '~> 3.26'
+gem 'jekyll-gfm-admonitions', '~> 1.2'

conf/_config.yml

@@ -48,6 +48,9 @@ keep_files: [".git", ".svn", "wiki-images", "images", "downloads"]
 lsi:  false # don't produce an index for related posts
 safe: false # disables plugins
 
+plugins:
+  - jekyll-gfm-admonitions
+
 markdown: kramdown
 
 highlighter: rouge