fix: allow multiple cronjobs

[aslafy-z]

The cronjob template misses a --- new document separation. This means all cronjobs are scrambled together and only a frankenstein version of all of them is emitted.
This PR also does some lint:

• move the new document separator to the beginning of templates
• add empty newline at the end of files
• remove empty newlines in the middle of files
• move helpers to _helpers file.

[d3adb5]

I would normally be wary of changes to whitespace, as they unnecessarily mess with blame information, but in this case they're only present at the end of each file and I doubt we'll run into any issues as a result.

LGTM! 👍

[github-actions]

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