Exclude some copies of old book editions from search engines

Author: kornelski

src/doc/robots.txt

@@ -17,3 +17,11 @@ Disallow: /1.0.0-beta.2/
 Disallow: /1.0.0-beta.3/
 Disallow: /1.0.0-beta.4/
 Disallow: /1.0.0-beta.5/
+Disallow: /book/first-edition/
+Disallow: /book/second-edition/
+Disallow: /stable/book/first-edition/
+Disallow: /stable/book/second-edition/
+Disallow: /beta/book/first-edition/
+Disallow: /beta/book/second-edition/
+Disallow: /nightly/book/first-edition/
+Disallow: /nightly/book/second-edition/