rename useRootTheme to createRootTheme

src/material/theme.ts

@@ -5,21 +5,22 @@ import { Accessor } from "solid-js";
 /**
  * The MUI theme.
  */
-export function useRootTheme(): Accessor<Theme> {
-  return () =>
-    createTheme({
-      palette: {
-        primary: {
-          main: deepPurple[500],
-        },
-        error: {
-          main: red[900],
-        },
-        secondary: {
-          main: amber.A200,
-        },
+export function createRootTheme(): Accessor<Theme> {
+  const theme = createTheme({
+    palette: {
+      primary: {
+        main: deepPurple[500],
       },
-    });
+      error: {
+        main: red[900],
+      },
+      secondary: {
+        main: amber.A200,
+      },
+    },
+  });
+
+  return () => theme;
 }
 
 export const ANIM_CURVE_STD = "cubic-bezier(0.4, 0, 0.2, 1)";