Nolan/yc demo

[NolanTrem]

[!IMPORTANT] Refactor UI components in Answer.tsx and SearchResults.tsx, and update agentUrl in index.tsx.

• Components:
  • Introduced SourceInfo component in Answer.tsx to handle source display logic.
  • Removed SourceItem component from Answer.tsx.
• Behavior:
  • Updated Answer.tsx to use SourceInfo for displaying source information.
  • Changed default tab in SearchResults.tsx from vectorSearch to kgEntities.
• Configuration:
  • Updated agentUrl in index.tsx to https://infra.sciphi.ai.

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