Address Sass '@import' deprecation warnings

Deprecation warnings:
- Deprecation Warning [import]: 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

Migrate to use of '@use', '@forward', and '@include' instead

Signed-off-by: David Chamberlain <[email protected]>

Author: chaoscommencer

_sass/minima.scss

@@ -1,9 +1,6 @@
 @charset "utf-8";
 
 // Import partials.
-@import
-  "minima/common",
-  "minima/base",
-  "minima/layout",
-  "minima/syntax-highlighting"
-;
+@use "minima/base" as *;
+@use "minima/layout" as *;
+@use "minima/syntax-highlighting" as *;

_sass/minima/_base.scss

@@ -1,3 +1,7 @@
+@charset "utf-8";
+
+@use "common" as *;
+
 /**
  * Reset some basic elements
  */

_sass/minima/_common.scss

@@ -1,3 +1,5 @@
+@charset "utf-8";
+
 // Define defaults for each variable.
 
 $base-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !default;

_sass/minima/_layout.scss

@@ -1,3 +1,8 @@
+@charset "utf-8";
+
+@use "common" as *;
+@use "base" as *;
+
 /**
  * Site header
  */

_sass/minima/_syntax-highlighting.scss

@@ -1,3 +1,7 @@
+@charset "utf-8";
+
+@use "base" as *;
+
 /**
  * Syntax highlighting styles
  */

assets/main.scss

@@ -2,4 +2,4 @@
 # Only the main Sass file needs front matter (the dashes are enough)
 ---
 
-@import "minima";
+@forward "minima";