Replace markdown plugin for faster one

syntax/markdown_jekyll.vim

@@ -0,0 +1,34 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'markdown') == -1
+
+let b:markdown_in_jekyll=0
+
+if getline(1) =~ '^---\s*$'
+  let b:markdown_in_jekyll=1
+
+  syn region markdownJekyllFrontMatter matchgroup=markdownJekyllDelimiter contains=@NoSpell
+    \ start="\%^---" end="^---$"
+
+  syn region markdownJekyllLiquidTag matchgroup=markdownJekyllDelimiter contains=@NoSpell oneline
+    \ start="{%" end="%}"
+
+  syn region markdownJekyllLiquidOutputTag matchgroup=markdownJekyllDelimiter contains=@NoSpell oneline
+    \ start="{{" skip=/"}}"/ end="}}"
+
+  syn region markdownJekyllLiquidBlockTag matchgroup=markdownJekyllDelimiter contains=@NoSpell
+    \ start="{%\s*\z(comment\|raw\|highlight\)[^%]*%}" end="{%\s*\%(no\|end\)\z1\s*%}"
+
+  silent spell! nocomment
+  silent spell! endcomment
+  silent spell! nohighlight
+  silent spell! endhighlight
+  silent spell! noraw
+  silent spell! endraw
+
+  hi def link markdownJekyllFrontMatter         NonText
+  hi def link markdownJekyllLiquidTag           NonText
+  hi def link markdownJekyllLiquidOutputTag     NonText
+  hi def link markdownJekyllLiquidBlockTag      NonText
+  hi def link markdownJekyllDelimiter           Delimiter
+endif
+
+endif