Deprecated Sass warnings

[MarcellavonderWeppen]

Hi there,

First of all, thank you for providing this beautiful theme! I've been using it for a project and wanted to let you know about some deprecation warnings that appeared when running jekyll serve locally. These warnings are related to Sass and could potentially cause issues in the future as Dart Sass evolves. Here are the details:

---

1. Deprecation Warning: @import is deprecated

Sass has deprecated the @import rule and plans to remove it entirely in Dart Sass 3.0.0. This affects the following lines in the file /assets/css/style.scss:

@import "bootstrap/functions";
@import "bootstrap-variables";
@import "bootstrap/variables";
@import "bootstrap/maps";

Suggested Solution: Replace @import with @use. Example:

@use "bootstrap/functions";

You can read more about this in the [official Sass documentation](https://sass-lang.com/d/import).

---

2. Deprecation Warning: Color Functions (lighten, darken)

Functions like lighten() and darken() are also deprecated. Here's an example from /assets/css/style.scss (line 13):

$link-hover-color: lighten($primary, 10%);

Suggested Solution: Replace these functions with color.adjust or color.scale. Example:

$link-hover-color: color.adjust($primary, $lightness: 10%);

More details can be found in the [color functions documentation](https://sass-lang.com/d/color-functions).

---

3. Other Deprecations

There are additional warnings related to global built-in functions like mix() and map-merge, as well as red(), green(), and blue(). While they don't currently break functionality, updating them to the latest standards would ensure compatibility with future Sass releases.

---

What Works

The theme works perfectly fine for now despite these warnings. However, addressing these issues will make the theme future-proof and compliant with Sass best practices.