Update devcontainer config

[Adammatthiesen]

This pull request includes several updates to the development container configuration to improve the setup process and ensure compatibility with new tools. The most important changes include updating the base image in the Dockerfile, modifying the post-create command, and updating the welcome message.

Development Container Configuration Updates:

• .devcontainer/Dockerfile: Updated the base image to a specific version using a SHA256 digest, enabled Proto, and ensured the correct Node version is installed.
• .devcontainer/devcontainer.json: Modified the postCreateCommand to remove the redundant corepack enable pnpm command.
• .devcontainer/welcome-message.txt: Updated the welcome message to include instructions for using ProtoCLI and installing dependencies.

[changeset-bot]

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Latest commit: c3a1dc0

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[studiocms-no-reply]

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