[x/blog] template: remove dead "Go on Google+" link from sidebar
[x/blog] template: remove dead "Go on Google+" link from sidebar

I was reading the blog post and noticed this dead link. Consider removing it.

(The G+ community link below this one is still working, at least until the service shuts down.)

Change-Id: I6f4cd045d3de776a468e9658b00ad35532503e60
GitHub-Last-Rev: 47f7fedf8d0c5fd8346c95d64bd54d2784b3eddf
GitHub-Pull-Request: golang/blog#18
Reviewed-on: https://go-review.googlesource.com/c/151837
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
X-Blog-Commit: 9fb197e6160de48a052009cf39ee526f80591e9c

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