Port request: Link CSS

[jenlampton]

Name of the module, theme, or layout link_css

Link to the drupal.org module, theme, or layout https://www.drupal.org/project/link_css

Link to the D7 source code https://git.drupalcode.org/project/link_css/-/tree/7.x-1.x?ref_type=heads

(Optional) Link to an issue in the drupal.org queue asking the Drupal community if anyone is working on a Backdrop port of this project todo