feat: Remove PDF processing dependencies and simplify load_data function to focus on webpage seeding

feat: Refactor embedding logic to support local sentence-transformers and Hugging Face API, update environment variable checks

feat: Inline rag_utils functions into upload_pdf.py for improved modularity and clarity

Remove unused embedding files and ingestion script; refactor PDF upload to handle embeddings directly

feat: Add document ingestion and embedding functionality

feat: update context in assistant prompt to include dentistry

chore: track PDFs with git-xet

feat: add embedding functionality with Supabase integration