Replacing gumdrop with a README

[blockiosaurus]

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[Copilot]

Pull Request Overview

This PR replaces the gumdrop program implementation with a README that redirects users to the separate mpl-gumdrop repository. Key changes include:

• Adding a new README.md in the gumdrop directory with useful links.
• Removing the gumdrop Rust source files, Cargo configuration, and auxiliary JavaScript SDK code and configuration files.
• Cleaning up outdated test files and build scripts related to the old gumdrop implementation.

Reviewed Changes

Copilot reviewed 37 out of 37 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
gumdrop/README.md	New README providing links to the new mpl-gumdrop repository
gumdrop/program/src/merkle_proof.rs	Removal of the Merkle proof verification code
gumdrop/program/Xargo.toml	Removal of Xargo configuration
gumdrop/program/Cargo.toml	Removal of Cargo configuration for the gumdrop program
gumdrop/js/test/gumdrop.ts	Removal of placeholder test file for gumdrop
gumdrop/js/src/mpl-gumdrop.ts	Removal of re-exported module files
gumdrop/js/src/errors.ts	Removal of error setup file
gumdrop/js/scripts/api-gen-ts.js	Removal of API generation script
gumdrop/js/README.md	Removal of JavaScript README previously describing gumdrop SDK
gumdrop/js/.prettierrc.js	Removal of Prettier config from the JS directory
gumdrop/js/.eslintrc.js	Removal of ESLint config from the JS directory

Comments suppressed due to low confidence (1)

gumdrop/README.md:1

• [nitpick] Consider maintaining consistent naming between 'Metaplex Gumdrop' and 'MPL Gumdrop' throughout the documentation for improved clarity.

# Metaplex Gumdrop