Updating .gitignore to ignore stuff built by kythe/web/site/build.sh
Updating .gitignore to ignore stuff built by kythe/web/site/build.sh

Reviewers: schroederc, salguarnieri

Reviewed By: salguarnieri

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1529

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