Removing Trash Guides reference as it no longer exists

[kwissss]

Removing Trash Guides reference that no longer exists. It was removed from Trash Guides back in 2022.

For new Sandbox app/role documentation, please confirm you have completed the following tasks:

• [] App documentation page created
• [] markdownlint reports no errors on edited page(s) - use https://dlaa.me/markdownlint/ if your IDE does not have this built in
• [] Reference added in docs/sandbox/index.md
• [] Reference added in mkdocs.yml nav menu

[saltydk]

Could just point to https://trash-guides.info/Guide-Sync instead.

[kwissss]

Something like that?

[saltydk]

Sure, LGTM. Will have to wait for @chazlarson since he runs this joint.