Remove obsolete tests and add new login page layout

- Deleted test files for NavLink, Navbar, NavbarBrand, Progress, Row, SearchBar, Select, Spinner, Textarea, and a basic test for Button.
- Introduced a new EmptyLayout component for consistent layout structure.
- Added a new login page with a layout that includes a login form and an ASCII art header.
- Updated CSS variables for improved styling consistency across components.
- Removed Vitest configuration file as it is no longer needed.

astro.config.mjs

@@ -5,7 +5,7 @@ import node from "@astrojs/node";
 
 // https://astro.build/config
 export default defineConfig({
-	adapter: node({
-		mode: "standalone",
-	}),
+  adapter: node({
+    mode: "standalone",
+  }),
 });