revert: cleanup zip-based lambda function

[Perry2004]

No description provided.

[Copilot]

Pull Request Overview

This is a revert commit that removes zip-based lambda function infrastructure. The PR removes the entire lambda function build and deployment pipeline along with its documentation.

• Removes GitHub Actions workflow for building and deploying lambda functions to S3
• Removes scripts documentation and README

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/README.md	Removes documentation for the Pexels Image Fetcher Python script
.github/workflows/build-lambda.yaml	Removes the complete CI/CD workflow for building and deploying lambda functions to S3

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