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

examples/modrinth/modrinth-projects/compose.yml

@@ -0,0 +1,16 @@
+services:
+  mc:
+    image: itzg/minecraft-server
+    tty: true
+    stdin_open: true
+    ports:
+      - "25565:25565"
+    environment:
+      EULA: "TRUE"
+      TYPE: FABRIC
+      MODRINTH_PROJECTS: fallingtree
+    volumes:
+      - data:/data
+
+volumes:
+  data: {}