* feat: support breadcrumbs for single pages that are neither docs or blogs.
* feat: support enabling breadcrumbs across different content types other than docs and blog
docs: added docs and examples for enabling breadcrumbs for specific content types
* feat: breadcrumbs being enabled is fully driven by the `breadcrumbs` front matter field.
docs: updated docs to reflect that there is no site parameter driving breadcrumbs
feat: enabled breadcrumbs for lists as well as singles for uniformity
* Removing _partials/utils/default-breadcrumbs-enabled.html in favour of extra parameterization of _partials/breadcrumb.html
* fix: change breadcrumbs parameter from `enabledByDefault` to `enable` to remain consistent with the rest of the theme
* Update layouts/_partials/breadcrumb.html
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Co-authored-by: Xin <5097752+imfing@users.noreply.github.com>
