src/doc/robots.txt

   1 User-agent: *
   2 Disallow: /1.
   3 Disallow: /0.
   4 Disallow: /book/first-edition/
   5 Disallow: /book/second-edition/
   6 Disallow: /stable/book/first-edition/
   7 Disallow: /stable/book/second-edition/
   8 Disallow: /beta/book/first-edition/
   9 Disallow: /beta/book/second-edition/
  10 Disallow: /nightly/book/first-edition/
  11 Disallow: /nightly/book/second-edition/