reorganize vim syntax highlighting info

There was already a tip about it; move the plasticboy version to there.

doc/ikiwiki/markdown.mdwn

@@ -6,8 +6,7 @@ email messages. It is the markup language used by this wiki by default.
 For documentation about the markdown syntax, see [[formatting]] and
 [Markdown: syntax](http://daringfireball.net/projects/markdown/syntax). A
 [markdown mode](http://jblevins.org/projects/markdown-mode/) for 
-emacs can help in editing, as can this
-[syntax file](http://plasticboy.com/markdown-vim-mode/) for vim.
+emacs can help in editing, as can the [[vim_syntax_highlighting]] file.
 
 Note that [[WikiLinks|WikiLink]] and [[directives|directive]] are not part
 of the markdown syntax, and are the only bit of markup that this wiki

doc/tips/vim_syntax_highlighting/discussion.mdwn

@@ -1 +1,8 @@
 I'm going to look at merging this with potwiki.vim (a vim-based personal wiki) so that you can follow wiki-links and auto-create pages etc., direct from vim. (I'm writing this incase I don't get around to it) -- [[JonDowland]]
+
+----
+
+Another attempt at the same thing is here:
+<http://plasticboy.com/markdown-vim-mode/>
+
+In my tests, [[ikiwiki.vim]] works better than that one, YMMV. --[[Joey]]