page: `tags/permlink`; add `breadcrumb`

[petecooper]

URLs

• Back: https://github.com/textpattern/textpattern.github.io/blob/master/tags/permlink.md
• Front: https://docs.textpattern.com/tags/permlink

Explanation of immediate task

Add breadcrumb explanation / example since it's available from the dropdown but has no explanatory notes on the permlink page linked from pophelp.

Resources to support effort

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Current to-dos

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