tiny fix for an import warning

[VatsalSy]

1. Deprecation Warning: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

More info and automated migrator: https://sass-lang.com/d/import

╷
4 │ @import "minima";
│ ^^^^^^^^
╵

2. Given that there are several markdown related documentation. Perhaps, it is a good idea to add that statistics in the github repository (?)

[Mar5bar]

Thanks! Sadly, this appears to break on GH Pages deployment (though does remove the local build warning)