Added a default quick installation section, and passed the custom installation README to another subsection. Moved the vxlan configuration to an external md file.

- Added health checks in the containers to enable readiness and liveness probes

- Implemented Probes and initContainers so the installation follows a specific order without having to manage it.

Implemented readinessProbe in l2sm-controller Deployment and added initContainers in l2sm-operator Deployment to ensure proper synchronization with l2sm-controller pod status before starting.

This change ensures that l2sm-operator does not start until l2sm-controller pod is in the Running state.

More typo fixes in installation guide

Fixed typo when referencing directory, custom_installation/ -> custom-installation/

Fixed loop  that occured when two bridges joined together and the switch, forming a loop that would take all the CPU usage from process systemd-networkd