chore: Remove config.yaml from version control

It is a local configuration file and should not be tracked.
sample-config.yaml is provided as a template.

config.yaml

@@ -1,26 +0,0 @@
-# Configuration for Meshtastic Network Monitor
-
-# List of Node IDs to prioritize for active testing (Traceroute, etc.)
-# Format: "!<NodeID>"
-# priority_nodes:
-#   - "!ad2836c3" 
-#   - "!51165eae"
-#   - "!cdabef97"
-#   - "!d75ae2a0"
-
-# Logging Level [warn|info|debug]
-log_level: info
-
-# Auto-Discovery Settings (Used if priority_nodes is empty)
-# Roles to prioritize for auto-discovery
-auto_discovery_roles:
-  - ROUTER_LATE
-  - ROUTER
-  - CLIENT
-
-# Limit number of auto-discovered nodes
-auto_discovery_limit: 5
-
-# Reporting Settings
-# Generate report after N full testing cycles
-report_cycles: 1