Remove github fork ribbon from tiddlywiki.com

We’ll keep using it on the /dev site, but now that we’ve got the link
panels we don’t need it on the main site

editions/tw5.com/tiddlers/system/github-fork-ribbon.tid

@@ -1,12 +0,0 @@
-title: $:/editions/tw5.com/github-fork-ribbon
-tags: $:/tags/PageControls
-caption: ~GitHub ribbon
-description: ~GitHub ribbon for tw5.com
-
-<div class="github-fork-ribbon-wrapper right">
-<div class="github-fork-ribbon" style="background-color:#DF4848;">
-<$link to="HelpingTiddlyWiki">
-Spread the Word
-</$link>
-</div>
-</div>

editions/tw5.com/tiddlywiki.info

@@ -3,7 +3,6 @@
 	"plugins": [
 		"tiddlywiki/googleanalytics",
 		"tiddlywiki/nodewebkitsaver",
-		"tiddlywiki/github-fork-ribbon",
 		"tiddlywiki/browser-sniff",
 		"tiddlywiki/railroad",
 		"tiddlywiki/help"