Minor fixes to make it easy to run locally.

[jlewi]

This is an unsolicited PR so feel free to close. Happy to make revisions as well. This PR fixes a couple minor issues I ran into while attempting to run the chatbot to use for my own purposes.

• ingest.py and ingest_examples.py raise an exception trying to delete the schemas

  • Catch these exceptions and keep going
  • My guess is the code was written as though the schemas had already been created and therefore wants to recreate them
  • This causes the aforementioned exceptions when starting with a fresh weaviate cluster

• Here's an example exception

  Traceback (most recent call last): File "/Users/jlewi/git_chat-langchain/ingest.py", line 42, in client.schema.delete_class("Paragraph") File "/opt/homebrew/lib/python3.10/site-packages/weaviate/schema/crud_schema.py", line 201, in delete_class raise UnexpectedStatusCodeException("Delete class from schema", response) weaviate.exceptions.UnexpectedStatusCodeException: Delete class from schema! Unexpected status code: 400, with response body: {'error': [{'message': "could not find class 'Paragraph'"}]}.

• Update ingest.sh to check if the documents have already been downloaded.

• Update the README.md with instructions about how to deploy it yourself.

• Add a .gitignore file