enabled multi document upload

Support multi-select document queries with source attribution

tweak uploaded files handling

Rollback files to e89d8916a3ff

bugfix #2

bugfix

improved UI/UX #3

improved UI/UX #2

improved UI/UX

added file upload section after every file upload success

removed outdated gradio, use hf auto gradio version instead

Refactored code, multi-doc support, external sample data, utils split for testability

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