Fix preventDefult on Breadcrumbs item

[PelayoFelgueroso]

…owsing to an unexisting page

Checklist
(Check off all the items before submitting)

• Build process is done without errors. All tests pass in the /lib directory.
• Self-reviewed the code before submitting.
• Meets accessibility standards.
• Added/updated documentation to /website as needed.
• Added/updated tests as needed.

Purpose
Fix preventDefult on Breadcrumbs item and modify examples to avoid browsing to an unexisting page.