Retires old success stories and redirects `/success-stories` to
`/customers`.
@eashaw, is there anything else / different that needs to be done to
retire these old pages? I suspect there will still be some article
category artifacts hanging around.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Updated story-related redirects so visitors are sent to the customers
page instead of older story URLs.
* Fixed deprecated device-management “fleet user story” links to land on
the customers page.
* Adjusted article page metadata and category resolution so the “success
stories” category no longer uses the previous titles/descriptions or
friendly-name mapping.
* **Chores**
* Updated static-content build rules for allowed category values and
adjusted how certain category URL prefixes are generated.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Eric <eashaw@sailsjs.com>
