Add "What's New?" message for wiki editing feature

src/jade/templates/home_page.jade

@@ -39,6 +39,13 @@
         .section
             h2 What's new?
             .panel
+                h3 2015-05-13
+                .entry
+                    p.
+                        As of today, you can now add and edit item descriptions right on Crafting Guide. This feature is
+                        starting small with just item descriptions, but eventually all the content on the site will be
+                        editable. All you need is a (free) GitHub account, and you're ready to go!
+
                 h3 2015-04-30
                 .entry
                     p.
@@ -137,23 +144,3 @@
                     p.
                         I spent some time today cleaning up the various animations throughout the site, and working on
                         page rendering performance. Things should generally feel a lot smoother now.
-
-                h3 2015-03-20
-                .entry
-                    p.
-                        Recently, I've been working on allowing mod authors to add more detail to the item pages here on
-                        Crafting Guide. To that end, there are a couple of new features to announce. First, item detail
-                        pages can now show text and pictures to describe the item (check out the <a
-                        href="/browse/buildcraft/assembly_table">Assembly Table</a> for an example).  Second, mods can
-                        now include tutorial pages containing similar text and pictures to describe tricky concepts,
-                        complex builds, or anything else their mod has to offer (see <a
-                        href="/browse/buildcraft/tutorials/gates_wires_and_chips">Gates, Wires, and Chips</a> for an
-                        example). Finally, both item pages and tutorial pages can display a list of YouTube videos. Only
-                        a few pages in the Buildcraft section have been updated so far, but keep an eye out for
-                        more to come!
-                    p.
-                        And... the second piece of news is that Crafting Guide now supports <a
-                        href="/browse/thermal_dynamics">Thermal Dynamics</a>! This mod is an off-shoot from <a
-                        href="/browse/thermal_expansion">Thermal Expansion</a> which contains all the ducts (item, fluid
-                        and redstone flux) you're used to from TE3 plus some extras both for higher capacity throughput
-                        and combining item ducts with redstone flux ducts.