* Update installation.md

* Update cli-usage.md

* Update installation.md

* Update directory-structure.md

* Update configuration.md

* Update overview.md

* Update section.md

* Update page.md

* Update section.md

* Update configuration.md

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* Update page.md

* Update shortcodes.md

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* Updates.

Added instructions on how to publish to <username>.github.io or <org>.github.io by changing the publishing branch in the repo to `master`. This should work for any type of GitHub publishing, including custom domains.

Fixes #765

* bump version in deployment docs

If not specified, Travis use a system with ruby, which we don't need. We can use the "minimal" one instead.