move custom styles completely to webpack encore and delete the old static css file

Author: Stephan Orbaugh

assets/styles/app.css

@@ -0,0 +1,23 @@
+:root {
+    --sidebar-bg: #0693e3;
+    --sidebar-menu-color: #fff;
+    --sidebar-logo-color: #fff;
+    --sidebar-menu-header-color: #fff;
+    --sidebar-menu-icon-color: #fff;
+    --sidebar-menu-submenu-color: #fff;
+    --sidebar-menu-active-item-color: #000;
+    --sidebar-menu-active-item-bg: #fff;
+
+    --link-color: #0693e3;
+
+    --pagination-active-bg: #0693e3;
+
+    --font-family-base: "M PLUS 1", "Open Sans", sans-serif;
+    --form-type-check-input-checked-bg: #0693e3;
+
+    --button-primary-bg: #0693e3;
+
+    --form-switch-checked-bg: #0693e3;
+
+    --badge-boolean-true-bg: #0693e3;
+}

public/css/admin.css

@@ -69,8 +69,7 @@ public function configureActions(): Actions
     public function configureAssets(): Assets
     {
         return parent::configureAssets()
-            ->addWebpackEncoreEntry('app')
-            ->addCssFile('css/admin.css'); // TODO: Change the autogenerated stub
+            ->addWebpackEncoreEntry('app');
     }
 
     public function configureCrud(): Crud