Documentation Improvisation changes for KKP fundamentals training materials

Made Documentation improvization changes across different training courses under KKP fundamentals
Adapted training scripts for the kubeone version update to 1.3.0 and kubernetes cluster version update to 1.21.5. Validated the setup.
Adapted the training scripts to KKP 2.18.2 release and validated the KKP setup
Create User Cluster MLA Stack setup Training material as per the feature release available from v2.18.2 KKP release

cloudnativetrainings / trainings