Merge branch 'fix-header-logo' into 'master'

Header logo now follows the theme

See merge request schdesign/roadmap!44

docs/stylesheets/extra.css

 /* Setting main color theme to schdesign style <3 */
 
-:root {
-}
-
 [data-md-color-scheme="default"] { /* Only applied when light theme (default) is selected */
 
   --schdesign-hue: 353;
@@ -63,3 +60,8 @@
   color: var(--md-accent-fg-color-invert);
   text-decoration: underline dotted var(--md-accent-fg-color-invert);
 }
+
+/* Use reddish logo when in dark mode */
+[data-md-color-scheme="slate"] img[alt="logo"] {
+  content: url("../../img/schdesign_s_logo_red.svg");
+}
\ No newline at end of file