Ability to modify styles of `code-fold`

[zibra]

Currently to set text-decoration of code-fold a I need to do something like: tr td a { text-decoration: none !important; } to be more specific than this rule: https://github.com/praneshr/react-diff-viewer/blob/6eda0f7cfcc3333cb8edb5f78e385253a970a37a/src/styles.ts#L255

If will be good to have codeFold property in the styles