Use centralised vector db

[valeksiev]

Describe the background of your pull request

Summary:

• remove local vector db
• remove static file ingestion
• remove static data files
• use centralised ChromaDB
• improve logging (cudos @valentinyanakiev )
• cleanup and format

Fixes #6

Additional context

Add any other context

Governance

• Documentation is added
• Test cases are added or updated

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