factorio, terraria: add page (#13231)

pages/linux/factorio.md

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+# factorio
+
+> Create and start a headless Factorio server.
+> More information: <https://wiki.factorio.com/Multiplayer>.
+
+- Create a new save file:
+
+`{{path/to/factorio}} --create {{path/to/save_file.zip}}`
+
+- Start a Factorio server:
+
+`{{path/to/factorio}} --start-server {{path/to/save_file.zip}}`

pages/linux/terraria.md

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+# terraria
+
+> Create and start a headless Terraria server.
+> More information: <https://terraria.wiki.gg/wiki/Server>.
+
+- Start an interactive server setup:
+
+`{{path/to/TerrariaServer}}`
+
+- Start a Terraria server:
+
+`{{path/to/TerrariaServer}} -world {{path/to/world.wld}}`