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.

.vscode/settings.json

@@ -1,11 +1,9 @@
 {
-	"editor.tabSize": 2,
-	"editor.formatOnSave": true,
-	"editor.defaultFormatter": "biomejs.biome",
-	"[astro]": {
-		"editor.defaultFormatter": "astro-build.astro-vscode"
-	},
-	"[css]": {
-		"editor.defaultFormatter": "biomejs.biome"
-	}
+  "editor.tabSize": 2,
+  "editor.formatOnSave": true,
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "[astro]": {
+    "editor.defaultFormatter": "astro-build.astro-vscode"
+  },
+  "typescript.tsdk": "node_modules/typescript/lib"
 }