Proper output for footnote definitions

Author: ralsina

src/markd/node.cr

@@ -70,7 +70,6 @@ module Markd
     property fence_offset = 0
     property? last_line_blank = false
     property? last_line_checked = false
-    property footnote_definitions = {} of String => Node
 
     property! parent : Node?
     property! first_child : Node?

src/markd/parsers/block.cr

@@ -106,7 +106,7 @@ module Markd::Parser
         end
 
         # Footnote definitionss are moved to the end of the document
-        footnotes.each_with_index do |(title, _), _|
+        footnotes.each do |(title, _)|
           node = footnote_definitions[title]
           node.unlink
           @document.append_child(node)

src/markd/renderers/html_renderer.cr

@@ -305,12 +305,24 @@ module Markd
 
     def footnote_definition(node : Node, entering : Bool) : Nil
       if entering
+        if !node.prev.type.footnote_definition?
+          newline
+          tag("section", {"class" => "footnotes", "data-footnotes" => nil})
+          newline
+          tag("ol")
+        end
         newline
         tag("li", {
           id: "fn-foobar",
         })
       else
         tag("li", end_tag: true)
+        if node == node.parent.last_child
+          newline
+          tag("ol", end_tag: true)
+          newline
+          tag("section", end_tag: true)
+        end
       end
     end