Specified boto3 sts region

Now checks for output folder before saving. Minor code cleaning

Fixed cleaning for semantic search. Handles text with backslashes in (if cleaned). Updated packages. requirements file for only keyword search added.

Assigned AWS bucket name to environmental variable

Added additional password auth for AWS-based files. Changed 'Clean' default to no

AWS credentials no longer a requirement for app to work

Gradio 4.21. Limitations on file size and creating embeddings. Added AWS integration