chore(bash) Remove relevance boost that never worked
chore(bash) Remove relevance boost that never worked

- This never worked and hasn't proven necessary.
- If we were to add it back in the future it'd likely be
  better done with custom modes.

Closes #2673.

highlightjs/highlight.js,highlightjs/highlight.js,carlokok/highlight.js,carlokok/highlight.js,isagalaev/highlight.js,isagalaev/highlight.js,carlokok/highlight.js,highlightjs/highlight.js,highlightjs/highlight.js,carlokok/highlight.js