add keyboard shortcuts for a 0,1,2 custom scorer

[depahelix2021]

Description

Motivation and Context

Add javascript to enable keyboard shortcuts when a custom scorer is configured for 0,1,2.
I made it s,d,f instead of a,s,d.
#738

How Has This Been Tested?

Manually

Screenshots or GIFs (if appropriate):

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• [] New feature (non-breaking change which adds new functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• [] 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.
• [] All new and existing tests passed.