_content/doc: remove link to old blog post from a prominent place

The linked blog post is from the days of GOPATH and can be confusing
with modern Go; we have a more official documentation page on
organizing Go modules now.

Change-Id: I01b67f750055a83d9ecc25c596719ffd842ef7ed
Reviewed-on: https://go-review.googlesource.com/c/website/+/534795
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Eli Bendersky <eliben@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
diff --git a/_content/doc/index.html b/_content/doc/index.html
index 802a9a0..d4ec6d8 100644
--- a/_content/doc/index.html
+++ b/_content/doc/index.html
@@ -353,7 +353,6 @@
 <li><a href="/blog/go-slices-usage-and-internals" aria-describedby="index-description">Go Slices: usage and internals</a></li>
 <li><a href="/blog/gif-decoder-exercise-in-go-interfaces" aria-describedby="index-description">A GIF decoder: an exercise in Go interfaces</a></li>
 <li><a href="/blog/error-handling-and-go" aria-describedby="index-description">Error Handling and Go</a></li>
-<li><a href="/blog/organizing-go-code" aria-describedby="index-description">Organizing Go code</a></li>
 </ul>
 
 <h3>Packages</h3>