misc: organize more of examples into subdirs as compose projects (#3608)

examples/auto-curseforge/skyfactory4/compose.yml

@@ -0,0 +1,16 @@
+services:
+  mc:
+    image: itzg/minecraft-server:java8
+    environment:
+      EULA: "true"
+      MODPACK_PLATFORM: AUTO_CURSEFORGE
+      CF_SLUG: skyfactory-4
+      CF_FILENAME_MATCHER: 4.2.4
+      CF_API_KEY: ${CF_API_KEY}
+      MEMORY: 3G
+    ports:
+      - "25565:25565"
+    volumes:
+      - mc-data:/data
+volumes:
+  mc-data: