remove scripts folder

[saminegash]

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Add directions for contributors. For example, do developers need to run poetry install after picking up these changes?

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[amirfz]

@saminegash before merging this. we need to close #301 since we no longer need to run those scripts (the blog writer demo project is a replacement for this pipeline). but could you keep a copy of the transcript_summarizer_aws_lambda.py just in case we need it later? maybe email that file to me so that we have a backup of it in case we ever need it.

[saminegash]

I think we can get the copy from this github commit hash if we ever need it so I don't think we need to keep elsewhere.