* 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

* Update page.md

* Update section.md

* Update page.md

* Update shortcodes.md

* Update linking.md

* Update table-of-contents.md

* Update syntax-highlighting.md

* Update taxonomies.md

* Update search.md

* Update sass.md

* Update index.md

* Update multilingual.md

* Update overview.md

* Update pages-sections.md

* Update pagination.md

* Update taxonomies.md

* Update rss.md

* Update sitemap.md

* Update robots.md

* Update 404.md

* Update archive.md

* Update overview.md

* Update installing-and-using-themes.md

* Update creating-a-theme.md

* Update netlify.md

* Update github-pages.md

* Update gitlab-pages.md

* Update index.md

* Update page.md

* Update section.md

* 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

Closes #745

* 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.

This commit expands the Netlify documentation page to include a
description of how to manually deploy a built Gutenberg site from the
command line.

This is extremely minor, but the initial `netlify.toml` example confused
me a bit because I didn't realize that it was using a *netlify*
variable; I thought I needed to replace something with a variable from
my own configuration.  I made a very minor edit to the docs to clarify.