Additional fixes to kythe getting-started website.  Cleaning some formatting, adding missing steps on properly setting up local ruby to run website locally.
Additional fixes to kythe getting-started website.  Cleaning some formatting, adding missing steps on properly setting up local ruby to run website locally.

Reviewers: schroederc

Reviewed By: schroederc

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1524

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