AVD Data Model for EVPN/VXLAN Deployment Guide - Domain A

[mitchv85]

Change Summary

• Add AVD data models for EVPN/VXLAN Domain A
• Update the techlib-vxlan-domain-a container to use lab-base:python3.11-avd-v5.1.0-clab0.60.1-rev1.1
• Add the avd directory, containing all validated AVD data models for domain-a to the labs/techlib-vxlan-domain-a directory
• Validated lab functionality by running make build, make deploy, and make validate in the Codespace lab. All worked as intended.
• Update the README.md file for techlib-vxlan-domain-a lab to include instructions related to AVD operations
• Remove unnecessary files from the tech-library/datacenter/evpnvxlan directory
• Update .gitignore in techlib-vxlan-domain-a directory to ignore unnecessary files
• Add graphite interactive topology to the techlib-vxlan-domain-a lab environment

Repository Checklist

• My code has been rebased from the upstream main branch