Typo in the CSS configuration

[AntoineB9]

Describe the bug

There are typos in the CSS configuration of the plugin, it is sometimes docsifyselect, and sometimes docisfyselect.

  --docsifyselect-menu-margin: 0px;
  --docsifyselect-menu-padding: 8px 32px 8px 16px;
  --docisfyselect-menu-width: 256px;

Steps to reproduce

Install the plugin and play with the CSS, the properties do not work if you do not use the typo when there is one.

Expected behavior

There should not be typos in the theme properties.

Thanks :)