Move style override to correct file

If you want to override Docsy's styles, you should do that from
_styles_project.scss not _variables_project.scss

Fix the mixup.

assets/scss/_styles_project.scss

@@ -0,0 +1,13 @@
+/* This file is provided by Docsy as an extension point for styling.
+Add styles or import other files. */
+
+@import "reset";
+@import "skin";
+
+//K8S-Docsy integration
+@import "custom";
+
+//Media queries
+@import "base";
+@import "tablet";
+@import "desktop";

assets/scss/_variables_project.scss

@@ -1,16 +1,5 @@
-/* This file is provided by Docsy as an entry point to styling.
-Add styles or override variables from the theme here. */
-
-@import "reset";
-@import "skin";
-
-//K8S-Docsy integration
-@import "custom";
-
-//Media queries
-@import "base";
-@import "tablet";
-@import "desktop";
+/* This file is provided by Docsy as an extension point for styling.
+Override variables from the theme here. */
 
 $primary: #326ce5;