overhauls of most service docs

templates/podman/compose/README.md

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+# Compose
+
+Put your compose.yaml here.

templates/podman/compose/compose.yaml

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+services:
+  foobar:
+    container_name: foobar
+    restart: always
+    image: localhost/foobar:latest
+    ports:
+      - "8080:8080"
+    volumes:
+      - /home/foobar/data:/var/app/data
+    security_opt:
+      - label=disable
+    userns_mode: keep-id