organize theme components into folders

Oqtane.Client/Themes/OqtaneTheme/Containers/Container.razor

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+@namespace Oqtane.Themes.OqtaneTheme
+@inherits ContainerBase
+<div class="container">
+    <div class="row px-4">
+        <div class="d-flex flex-nowrap">
+            <ModuleActions /><h2><ModuleTitle /></h2>
+        </div>
+        <hr class="app-rule" />
+    </div>
+    <div class="row px-4">
+        <div class="container">
+            <ModuleInstance />
+        </div>
+    </div>
+</div>
+
+@code {
+    public override string Name => "Standard Header";
+}