Exclude irb from documentation generation

- IRB has its own documentation in the project readme and https://ruby.github.io/irb/ already.
- As a tool, its internal implementation details are not relevant to the user.
- Excluding it from the documentation generation reduces the size of the generated documentation
  and makes search results more relevant.

I also checked the there are no references to IRB so it should not break any links.

1 files changed, 0 insertions, 1 deletions

diff --git a/lib/irb/.document b/lib/irb/.document
deleted file mode 100644
index 3b0d6fa4ed..0000000000
--- a/lib/irb/.document
+++ /dev/null
@@ -1 +0,0 @@
-**/*.rb