Improved time taken reporting and readme

Improved logging

Added user guide and modified intro text

Redaction tool can now export pdfs with selectable text retained - redacted text is deleted and covered with a black box. Licence change for pymupdf use.

Optimised Textract and Tesseract workings

Added possibility to do authentication with AWS Cognito on load. Other minor changes.

Added opencv installation to dockerfile and reverted to slim-bookworm

Changed sdk to docker in readme.md

Initial commit