* feat: add support for `hideBreadcrumbs` front-matter param
* docs(en): add some docs about breadcrumb nav, including new hideBreadcrumbs param
* fix: fix typo in hideBreadcrumbs param check in breadcrumbs.html partial
* docs(en): tidy up the Breadcrumb Navigation documentation
* fix: rework hideBreadcrumbs param to breadcrumbs; update docs accordingly
* fix: use relpermalink in breadcrumb
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Co-authored-by: Xin <xin@imfing.com>