Revamp Swarm example documentation and streamline deployment instructions

- Consolidated and simplified Swarm example README to focus on YAML header comments for documentation.
- Removed redundant and extended sections, replacing with concise steps for getting started.
- Standardized YAML headers across `easyhaproxy.yml`, `services.yml`, and `portainer.yml` with a clearer and more readable format.
- Enhanced user guidance for deployment, setup requirements, verification, and cleanup.

examples/docker/docker-compose-changed-label.yml

@@ -1,8 +1,40 @@
-# To test:
-# curl -k -H "Host: host1.local" https://127.0.0.1/
+# ==============================================================================
+# EXAMPLE: Custom Label Prefix
+# ==============================================================================
 #
-# or add to /etc/hosts
-# 127.0.0.1 host1.local
+# WHAT THIS DEMONSTRATES:
+# - Using a custom label prefix instead of default "easyhaproxy"
+# - Useful for running multiple EasyHAProxy instances
+# - Custom label configuration (haproxy.* instead of easyhaproxy.*)
+#
+# REQUIREMENTS (run these first):
+# ```bash
+# # Add to /etc/hosts (idempotent)
+# grep -q "host1.local" /etc/hosts || echo "127.0.0.1 host1.local" | sudo tee -a /etc/hosts
+# ```
+#
+# HOW TO START:
+# ```bash
+# docker compose -f docker-compose-changed-label.yml up -d
+# ```
+#
+# HOW TO VERIFY IT'S WORKING:
+# ```bash
+# # Test HTTPS
+# curl -k -H "Host: host1.local" https://127.0.0.1/
+# # Expected: 200 OK with hostname in response
+#
+# # Verify custom label prefix is working
+# docker inspect $(docker ps -q -f "ancestor=byjg/static-httpserver") | grep "haproxy.http"
+# # Expected: Labels starting with "haproxy." instead of "easyhaproxy."
+# ```
+#
+# CLEAN UP:
+# ```bash
+# docker compose -f docker-compose-changed-label.yml down
+# ```
+#
+# ==============================================================================
 
 services:
   haproxy: