site: move contributing page to wiki

site/index.md

@@ -179,8 +179,7 @@ If you feel the same way, join us!
 <div class="indent1">
 ### fully documented
 
-Time to check out those **[docs](docs.html)**,
-or maybe **[look deeper](contributing.html)**.
+Time to check out those **[docs](docs.html)**!
 
 </div>
 

site/release-notes.md

@@ -1152,7 +1152,7 @@ Mitchell Rosen, Hans-Peter Deifel, Brian Scott, and Andrew Jones.
 
 -   tools/simplebench has been spun off as the [quickbench](http://hackage.haskell.org/package/quickbench) package.
 
--   add Appveyor CI builds, provide [more up-to-date Windows binaries](http://hledger.org/contributing.html#quick-links)
+-   add Appveyor CI builds, provide more up-to-date Windows binaries
 
 -   extra: add a bunch of CSV rules examples
 

site/site.tmpl

@@ -50,7 +50,7 @@
               <ul class="nav navbar-nav">
                 <li><a href="/download.html">Download</a>
                 <li><a href="/docs.html">Docs</a>
-                <li><a href="/contributing.html">Contribute</a>
+                <li><a href="https://github.com/simonmichael/hledger/wiki/Dev-Zone">Contribute</a>
               </ul>
             </div>
           </div>