Fix some game ids and clarify rules 6 and 7. (#143)

* Fix wrongly named game ids of l4d, l4d2 and q3a

* Specify how edition/protocol names are appended to games, rule 7

* Clarify rule 6 regarding numbers

* Add/Update badge

* Fix rule 7 misswording

* Fix 7 Days to Die

* List id changes in the changelog

* Forgot to fix test

* Apply Douile suggestion regarding rule 6

Co-authored-by: Tom <25043847+Douile@users.noreply.github.com>

* Fix typo on rule 6 and wrap text

* Clarify further rule 7

---------

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Tom <25043847+Douile@users.noreply.github.com>

.github/badges/node.svg

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-  <title>Node game coverage: 12%</title>
+<svg width="163.6" height="20" viewBox="0 0 1636 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Node game coverage: 11%">
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