added tip about page navigation from within vim

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+The [ikiwiki-nav](http://www.vim.org/scripts/script.php?script_id=2968) plugin
+for vim eases the editing of IkiWiki wikis, by letting you "follow" the
+wikilinks on your file (page), and loading the file associated with a given
+wikilink in vim. The plugin takes care of following the ikiwiki linking rules
+to figure out which file a wikilink points to 
+
+The plugin also includes commands (and mappings) to make the cursor jump to the
+previous/next wikilink in the current file 
+
+##  Jumping to pages 
+
+To open the file associated to a wikilink, place the cursor over its text, and
+hit Enter (`<CR>`). This functionality is also available through the
+`:IkiJumpToPage` command 
+
+## Moving to next/previous wikilink in current file 
+
+`Ctrl-j` will move the cursor to the next wikilink. `Ctrl-k` will move it to the
+previous wikilink. This functionality is also available through the
+`:IkiNextWikiLink` command. This command takes one argument, the direction to
+move into 
+
+  * `:IkiNextWikiLink 0` will look forward for the wikilink 
+  * `:IkiNextWikiLink 1` will look backwards for the wikilink 
+
+## Current issues: 
+
+  * The plugin only works for wikilinks contained in a single text line;
+    multiline wikilinks are not (yet) seen as such 
+
+## Notes 
+
+The official releases of the plugin are in the
+[vim.org script page](http://www.vim.org/scripts/script.php?script_id=2968)
+
+The latest version of this script can be found in the following location 
+
+<http://git.devnull.li/cgi-bin/gitweb.cgi?p=ikiwiki-nav.git;a=blob;f=ftplugin/ikiwiki_nav.vim;hb=HEAD>
+
+Any feedback you can provide is appreciated; the contact details can be found
+inside the plugin
+
+[[!tag vim]]