chore: remove unused environment variables and update layout components

- Deleted the .env and src/env.d.ts files as they are no longer needed.
- Updated BaseLayout to require title and description props directly, ensuring better clarity in component usage.
- Adjusted various pages to pass explicit title and description values, enhancing SEO and user experience.
- Increased print width in .prettierrc.mjs for improved code formatting.

src/env.d.ts

@@ -1,9 +0,0 @@
-/// <reference path="../.astro/types.d.ts" />
-interface ImportMetaEnv {
-	readonly DEFAULT_TITLE: string;
-	readonly DEFAULT_DESCRIPTION: string;
-}
-
-interface ImportMeta {
-	readonly env: ImportMetaEnv;
-}