Four redirects and one page image point at 404s

Ran a link checker I wrote over the repo and read every hit by hand. Five are still live problems, and four of them sit in redirects.yaml, so visitors hit them rather than editors

https://ubuntu.com/LoCo returns 404 today, so this is user facing rather than theoretical. The loco.ubuntu.com host itself redirects to https://ubuntu.com/community/docs/locos, which is also 404, so the destination is gone on both sides

So I have not opened a PR because each of these needs your intent rather than a mechanical fix. I cannot tell where LoCo or the Orange Pi Zero pages should point now, and I do not know which image digital-signage was meant to show. Tell me where you want them to go and I will send the change

Lower priority, mentioned for completeness: templates/shared/contextual_footers/_iot_for_developers.html links to http://developer.ubuntu.com/en/snappy/, which is dead, but that template is not included anywhere in the repo, so it may want deleting rather than fixing

All checked with curl following redirects and a browser user agent. Dead links inside the versioned charmed-k8s docs were left alone on purpose, since old doc versions are usually frozen

Start with the five entries listed in redirects.yaml and templates/internet-of-things/digital-signage.html, then review the reported curl results and the unused contextual footer template. Confirm the intended replacement destinations with a maintainer before editing. Done means the selected redirects and image URL resolve successfully, while any decision about the unused footer is documented.