Switch all extensions to .yaml for consistency

docker/counter-strike-1.6.yaml

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+#################################################################
+#                                                               #
+# Description: Counter-Strike 1.6 Multiplayer Server            #
+# ReferenceURL: https://github.com/febLey/counter-strike_server #
+#                                                               #
+#################################################################
+
+services:
+  counter-strike:
+    container_name: counter-strike
+    image: febley/counter-strike_server:latest
+    restart: always
+    environment:
+      - PORT=27015
+      - MAP=de_dust2
+      - MAXPLAYERS=16
+      - SV_LAN=0
+    ports:
+      - 27015:27015/udp
+      - 27015:27015
+    volumes:
+      - /opt/cs16-data/banned.cfg:/hlds/cstrike/banned.cfg
+      - /opt/cs16-data/listip.cfg:/hlds/cstrike/listip.cfg
+      - /opt/cs16-data/server.cfg:/hlds/cstrike/server.cfg
+      - /opt/cs16-data/mapcycle.txt:/hlds/cstrike/mapcycle.txt