docs: add knowledge base

docs/kb_sections/dzg003.adoc

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+[[DZG-003, DZG-003]]
+== DZG-003: On Steam Deck, DayZ becomes unresponsive/sluggish over time
+Last updated: {d}
+
+When DayZ is open for 1+ hours, a gradual loss in performance and FPS may occur on the Steam Deck.
+
+A solution that seems to work for most users is to install https://github.com/CryoByte33/steam-deck-utilities[Cryo Utilities], a third-party performance management application.