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

examples/modrinth/bmc4/compose.yml

@@ -0,0 +1,20 @@
+services:
+  mc:
+    image: itzg/minecraft-server
+    environment:
+      EULA: true
+      MODPACK_PLATFORM: MODRINTH
+      # NOTE: v36 doesn't startup correctly
+      MODRINTH_MODPACK: https://modrinth.com/modpack/better-mc-forge-bmc4/version/v34.5
+      MODRINTH_OVERRIDES_EXCLUSIONS: |
+        config/paxi/datapacks/BE_default_endgen_fix*
+      MODRINTH_FORCE_SYNCHRONIZE: true
+      MEMORY: 4G
+    ports:
+      - "25565:25565"
+    volumes:
+      - mc-data:/data
+      # or use a host directory binding
+#      - ./data:/data
+volumes:
+  mc-data: