Set the metalsmith branch to use ignores-support

This was done for a few reasons:

1. The `mybuild` branch is quite outdated.
2. `mybuild` had the `options remove: false` feature, which has been
replaced by `clean(false)`.
3. `ignores-support` now has an open PR making it a meaningful branch,
hopefully to be merged into master soon.

Once it's merged, we can migrate away from that branch linking entirely.
Fixed small formatting error with the code block
Added html minifying
Merge branch 'code-htmlminify' into preview

Conflicts:
	.metalsmith/gulpfile.coffee
	.metalsmith/package.json
Added metalsmith minify to the build command.
Merge branch 'code-htmlminify' into preview

Conflicts:
	.metalsmith/gulpfile.coffee