Add Two new Features (from Helpers4)

[baxyz]

What type of PR is this?

• Add a new dev container collection
• Update to an existing dev container collection
• Documentation/spec update
• Other containers.dev site update (UX, layout, etc)

Related Issues

• Related Issue #
• Closes #

Description

• Migrates archived baxyz' Features (Git Absorb, Shell History Per Project) to the helpers4' Features while keeping the maintainer.
• Adds two adjacent helpers4 Features: Angular Dev and Local Mounts.
• Removes the obsolete Biome entry.
• Aligns names by dropping the “Feature” suffix.

Collection checklist

If your PR contributes a new collection, please utilize this checklist:

• Collection name: Git Absorb / Shell History Per Project / Angular Dev / Local Mounts
• Maintainer name: baxyz
• Maintainer contact link: https://github.com/helpers4/devcontainer/issues
• Repository URL: https://github.com/helpers4/devcontainer
• OCI Reference: ghcr.io/helpers4/devcontainer/
• I acknowledge that this collection provides new functionality, distinct from the existing collections part of this index.

[baxyz]

@microsoft-github-policy-service agree