[kudu-CR](gh-pages) Add a 'site_tool proof' command which runs htmlproof

["Todd Lipcon (Code Review)" <ge...@cloudera.org>]

Hello Misty Stanley-Jones,

I'd like you to do a code review.  Please visit

    http://gerrit.cloudera.org:8080/2544

to review the following change.

Change subject: Add a 'site_tool proof' command which runs htmlproof
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Add a 'site_tool proof' command which runs htmlproof

This adds a checker script for broken links, and also fixes one. There are a
few more broken links in the docs.

Change-Id: I7f70080d06fdf2cbe9148522e17cba8733958da9
---
M .gitignore
M Gemfile
M Gemfile.lock
M README.adoc
M _config.yml
M overview.html
M site_tool
7 files changed, 78 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/44/2544/1
-- 
To view, visit http://gerrit.cloudera.org:8080/2544
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I7f70080d06fdf2cbe9148522e17cba8733958da9
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: gh-pages
Gerrit-Owner: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Misty Stanley-Jones <mi...@apache.org>