Changes `breadcrumbs` config into an object to add customizations such as hiding current page and changing the text of
the home crumb.
By default, Typo will now show breadcrumbs. If breadcrumbs are enabled, the current default of showing the
current page crumb is preserved.
BREAKING CHANGE: `breadcrumbs` is now an object so existing `breadcrumbs = <true/false>` line in config needs to be changed.