x/blog/from-zero-to-go-launching-on-google: multiple bad link issues

[minux]

http://blog.golang.org/from-zero-to-go-launching-on-google

issues:
1. http://google-turkey.appspot.com/thumb/20332620 gives internal server error.
2. loadOnce [[http://golang.org/pkg/sync/#Once][sync.Once]] in the program snippet,
i don't know what should we do about links in snippets.
3. the image in performance sections are not displayed inline.

[adg]

Comment 1:

Owner changed to @adg.

[gopherbot]

Comment 2 by jeff.allen:

I'm working on this. :)

[gopherbot]

Comment 3:

CL https://golang.org/cl/53670043 references this issue.