Expand and update hook integration docs

[o1oo11oo]

• Use current node LTS in example Dockerfile
• explain the scanparameter in JavaScript hooks
• fix template helm docs syntax
• add maketarget to generate docs

Closes #349

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[o1oo11oo]

One thing left open, in the issue I also mentioned that the template example is a bit barebones compared to most ScanCompletionHook yaml templates that we actually use. For implementing the Dependency-Track hook I compared the template to the ones used by DefectDojo and Elastic. Should we include more properties in the example or is what's listed enough?