blog: remove Google+ link from sidebar

Fixes golang/go#31295

Change-Id: Ic9fa20c55a3c33f075a720261b8b76bf1b8c4d42
Reviewed-on: https://go-review.googlesource.com/c/blog/+/170978
Reviewed-by: Andrew Bonventre <andybons@golang.org>
diff --git a/template/root.tmpl b/template/root.tmpl
index 9de7d43..9a88072 100644
--- a/template/root.tmpl
+++ b/template/root.tmpl
@@ -101,7 +101,6 @@
 	<li><a href='//tour.golang.org/'>A Tour of Go</a></li>
 	<li><a href='//golang.org/doc/'>Go Documentation</a></li>
 	<li><a href='//groups.google.com/group/golang-nuts'>Go Mailing List</a></li>
-	<li><a href='//plus.google.com/communities/114112804251407510571'>Go+ Community</a></li>
 	<li><a href='//twitter.com/golang'>Go on Twitter</a></li>
 	</ul>