[Issue #84] TrilioVault Backup and Restore Solution for DOKS

[v-ctiutiu]

Fixes #84

Overview

• Added TrilioVault for Kubernetes sub-chapter.
• Adapted main chapter for both backup and restore solutions: Velero and TVK.
• Updated links and overall layout.
• Created required diagrams, histograms, etc.
• Minor fixes and enhancements for Velero.

[bikram20]

Looks good to me. Thank you for the detailed work.