Move yanfali_wkl community keymap

[dunk2k]

Description

• move yanfali_wkl community keymap from 60_tsangan_hhkb to 60_ansi_wkl_split_bs_rshift
• minor amendments made to keymap to match/fit target layout
• licence header added
• 'yanfali-wkl' symlink removed

cc: @yanfali

Types of Changes

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

Issues Fixed or Closed by This PR

• n/a

Checklist

• My code follows the code style of this project: C, Python
• 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.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[dunk2k]

superseded by #22485