docs: update module count after Hell Let Loose removal

[ValgulNecron]

Before: the repository components page said the modules repo holds 30 game templates.

After: it says 29 and notes that Hell Let Loose was withdrawn after v0.3.0.

The release history in the roadmap and changelog stays as shipped. The Hell Let Loose card on the games page is a visual change, so it waits for a website.pen update first.

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