3D renders are still beta

@Jake0oo0 fyi

We haven't changed anything on our 3D renders since we first introduced them.
They still have rendering glitches, they still don't render the jacket layer,
they still don't support alex-type skins.

Telling people this is no longer beta (@2515575) doesn't seem like a good idea.

lib/views/index.jade

@@ -112,6 +112,7 @@ block content
             h3 3D Renders
           p
             | Crafatar also provides support for 3D renders of Minecraft skins.<br>
+            | Please note that <b>this feature is currently beta</b>!<br>
             | Replace
             mark.green  userid
             |  with a Mojang <b>UUID</b> or <b>username</b> to get a render of the skin.