Feat/leaf template (#7)

* fix(template) : Change `Ethernet3`configuration
* fix(Template): Missing Underlay configuration
* Fix(template) : error 'ipam.models.ip.IPAddress DoesNotExist
* fix(routing) : ! IP routing not enabled
* fix(leaves template): adding ip routing and multi-agent model

.gitignore

@@ -1,12 +1,13 @@
 .DS_Store
 documentation/assets/images/diagrams/.$VXLAN.drawio.bkp
-clab-vxlan-evpn-l2/*
+fabric_vxlan/*
 netbox/
 .env
 .venv
 .python-version
-containerlab/clab-vxlan-evpn-l2
-containerlab/.lab_vxlan.yml.bak
+containerlab/clab-vxlan_fabric
 .vscode/settings.json
 vxlan_automation.egg-info
 __pycache__
+containerlab/.fabric_vxlan.yml.bak
+containerlab/network_images/*.tar.xz