refactor: minor lint fixes & improve docs for TLD other than default

[sheldonhull]

📘 Documentation

• Include detail on providing tld in the configuration, allowing eu and other TLDs to be used.
• Mention tilt up in the initial setup config as viable option.

🤖 CI & Build

• Improve mage tasks with secret setup and tear down for better development support and troubleshooting.
• Bump go version in release pipeline to use 1.21 as can include standard library security improvements.
• Remove failing error condition on mage job:rebuild to better allow default setup without running local builds, such as just using the published docker image.
  This supports easier demo/test usage by support.

🔨 Refactor

• Improve logging with error wrapping and remove deprecated Go ioutil usage.

⬆️ Dependencies

• Bump tooling such as changie, release, trunk, more security scanners.
• Other dependency bumps such as golang.org/x/net.

fixes AB#526486