Remove unnecessary file

frontend/src/customTheme.js

@@ -1,27 +0,0 @@
-import { Themes } from '@geist-ui/core'
-
-const customDarkTheme = Themes.createFromLight({
-  type: 'custom-dark',
-  palette: {
-    background: '#1e1e1e',
-    foreground: '#d4d4d4',
-    selection: '#2c313a',
-    secondary: '#858585',
-    code: '#d4d4d4',
-    border: '#333333',
-    success: '#4EC9B0',
-    warning: '#9CDCFE',
-    error: '#F44747',
-  },
-  expressiveness: {
-    dropdownBoxShadow: '0 0 0 1px #333333',
-    shadowSmall: '0 0 0 1px #333333',
-    shadowMedium: '0 0 0 1px #333333',
-    shadowLarge: '0 0 0 1px #333333',
-  },
-})
-
-export const customTheme = {
-  light: Themes.light,
-  dark: customDarkTheme,
-}