[keyboard] add bear_face/v3, bear_face keyboard folder maintenance

[will-hedges]

Description

• Added bear_face/v3
• Updated info.jsons, keymaps to include LAYOUT, LAYOUT_all where applicable
• Updated bootloader options, imgur link in readme
• Updated keyboard-level files to be consistent with PR checklist
• Updated copyrights with github username

Types of Changes

• [ ] Core
• [ ] Bugfix
• [ ] New feature
• [ ] Enhancement/optimization
• [x] Keyboard (addition or update)
• [x] Keymap/layout/userspace (addition or update)
• [ ] Documentation

Issues Fixed or Closed by This PR

• N/A

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] I have read the PR Checklist document and have made the appropriate changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).