feat: Updated based on ECS workshop experience

[Hoseong-Seo]

Issue #, if available:

Description of changes:

• SBT and ECS are installed completely independently
• README updated - High level architecture update and so on. (Korean version added)
• Provisioning Source uploaded script added
• Advanced tier ECS is provisioned at initial installation.
• tenant id pattern changed: tenant name + id
• Github'Security applied

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