separate thems into separate files

src/seqta/ui/themes/removeTheme.ts

@@ -0,0 +1,18 @@
+import { CustomTheme } from '../../../interface/types/CustomThemes';
+
+
+export const removeTheme = (theme: CustomTheme) => {
+  // Remove custom CSS
+  const styleElement = document.getElementById('custom-theme');
+  if (styleElement) {
+    styleElement.parentNode?.removeChild(styleElement);
+  }
+
+  // Reset default color
+  //browser.storage.local.set({ selectedColor: '' });
+  // Remove custom images
+  const customImageVariables = theme.CustomImages.map((image) => image.variableName);
+  customImageVariables.forEach((variableName) => {
+    document.documentElement.style.removeProperty('--' + variableName);
+  });
+};