Feature: Add Rocknix system

[Sparticuz]

Rocknix replaced JELOS. Also added missing systems for it.

[github-actions]

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[emmercm]

@Sparticuz thank you for this!

Here's what I'm thinking: it probably makes sense to add a new {rocknix} token for clarity, that for now will behave the same as {jelos} (same underlying config, as you have here). That would require updates to:

• Renaming {jelos} in docs/output/tokens.md
• Moving docs/usage/handheld/jelos.md to docs/usage/handheld/rocknix.md and adding a redirect in mkdocs.yml
• Renaming {jelos} in src/modules/argumentsParser.ts
• Adding {rocknix} to src/types/outputFactory.ts
• Adding {rocknix} to test/outputFactory.test.ts

the end result being a backward-compatible rename, where {jelos} can be phased out later, but for now will just be removed from documentation.

Is this something you'd like to try your hand at?

[Sparticuz]

Feel free to take what I've done and build it out. I won't be able to contribute anytime soon