Fix color overrides (squidfunk/mkdocs-material#4755)

Author: Tiryoh

docs/css/colors.css

@@ -1,8 +1,8 @@
-[data-md-color-scheme="rt-red"] {
+:root, [data-md-color-scheme=default] {
     --md-primary-fg-color:        #e50012;
     --md-primary-fg-color--light: #ECB7B7;
     --md-primary-fg-color--dark:  #90030C;
     --md-accent-fg-color: #e500129a;
     --md-footer-bg-color: hsla(0, 0%, 0%, 0.32);
     --md-footer-bg-color--dark: hsla(0, 0%, 0%, 0.87);
-}
+}

mkdocs.yml

@@ -5,8 +5,6 @@ theme:
   logo: img/rt-logo-32x32.png
   favicon: https://rt-net.github.io/tutorials/img/rt-logo-32x32.png
   font: Incosolata
-  palette:
-    scheme: rt-red
   features:
     - navigation.expand
     - navigation.tabs