message: Adapt link to CTF docs
diff: @@ -164,7 +164,7 @@ conveniently using the official
  tool.
  For detailed instructions and examples please refer to
  -[the _Hosting a CTF event_ appendix of our (free) companion guide ebook](https://bkimminich.gitbooks.io/pwning-owasp-juice-shop/content/appendix/ctf.html).
  +[the _Hosting a CTF event_ appendix of our (free) companion guide ebook](https://bkimminich.gitbooks.io/pwning-owasp-juice-shop/content/part1/ctf.html).
  ## Additional Documentation
  