✨(frontend) refactor and theme token update

The configuration file has been simplified by importing configurations
from @gouvfr-lasuite/ui-kit . Colors and components have been updated to
reflect the new values. Additionally, adjustments have been made to
global styles, including the addition of styles for Material icons. Form
components have also been modified to incorporate the new style
properties.

src/frontend/apps/impress/cunningham.ts

@@ -1,4 +1,8 @@
-import { cunninghamConfig as tokens } from '@gouvfr-lasuite/ui-kit';
+import { cunninghamConfig } from '@gouvfr-lasuite/ui-kit';
+
+const tokens = {
+  ...cunninghamConfig,
+};
 
 const customColors = {
   'primary-action': '#1212FF',
@@ -34,7 +38,6 @@ const customColors = {
   'yellow-500': '#B7A73F',
   'yellow-600': '#66673D',
 };
-
 tokens.themes.default.theme.colors = {
   ...tokens.themes.default.theme.colors,
   ...customColors,