Jekyll Relative Links plugin - Use {% base %} before your relative link to add the correct path to the beginning of your URL

relative_links.rb

module Jekyll
  class Base < Liquid::Tag
    def initialize(tag_name, text, tokens)
      super
    end
    def render(context)
      page = context['page']
      depth = page['path'].split('/').size()
      case depth
      when 1
        $base = '.'
      when 2
        $base = '..'
      when 3
        $base = '../..'
      when 4
        $base = '../../..'
      when 5
        $base = '../../../..'
      end
      $base
    end
  end
end

Liquid::Template.register_tag('base', Jekyll::Base)