strict language filtering

there're people that only know javascript, and they find that repos are prone to having minuscule amounts of javascript in them that is practically non-existent.

The issue proposes stricter language filtering so repositories with only negligible amounts of JavaScript are not shown to JavaScript-focused users. No files, tests, threshold, or filtering entry point are named; first locate the repository search and language-filtering behavior, then clarify the minimum JavaScript amount and define done with an example or test.

Written by the indexing model from the issue text.