feat: update footer link formatting and add shadcn-nuxt integration

- Refactored footer.vue to improve link formatting.
- Updated nuxt.config.ts to include shadcn-nuxt and added necessary HTML attributes and meta tags for SEO.
- Added new dependencies in package.json for class-variance-authority, clsx, lucide-vue-next, reka-ui, shadcn-nuxt, tailwind-merge, and tailwindcss-animate.
- Cleaned up unused template tags in headlines.vue, index.vue, and news/[provider]/[slug].vue.
- Simplified sources.vue template structure.
- Improved login.vue styles for better animation.
- Enhanced google.ts API handler for better error handling and code clarity.
- Updated find/newsOrg.ts to ensure consistent code style.
- Added CSS variables and improved Tailwind configuration in main.css and tailwind.config.js.
- Created components.json for shadcn integration and added new UI components (Alert, Button, Progress) with respective styles and variants.
- Implemented utility functions in utils.ts for class name merging and value updating.

components/ui/alert/index.ts

@@ -0,0 +1,23 @@
+import { cva, type VariantProps } from "class-variance-authority";
+
+export { default as Alert } from "./Alert.vue";
+export { default as AlertDescription } from "./AlertDescription.vue";
+export { default as AlertTitle } from "./AlertTitle.vue";
+
+export const alertVariants = cva(
+  "relative w-full rounded-lg border px-4 py-3 text-sm [&>svg+div]:translate-y-[-3px] [&>svg]:absolute [&>svg]:left-4 [&>svg]:top-4 [&>svg]:text-foreground [&>svg~*]:pl-7",
+  {
+    variants: {
+      variant: {
+        default: "bg-background text-foreground",
+        destructive:
+          "border-destructive/50 text-destructive dark:border-destructive [&>svg]:text-destructive",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  },
+);
+
+export type AlertVariants = VariantProps<typeof alertVariants>;