♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

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Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/dist/cli/exec.js

@@ -1,23 +0,0 @@
-import { NonZeroExitError, x } from "tinyexec";
-function exec(command, args, options) {
-  return x(command, args, {
-    throwOnError: true,
-    ...options
-  }).then(
-    (o) => o,
-    (e) => {
-      if (e instanceof NonZeroExitError) {
-        const fullCommand = args?.length ? `${command} ${args.map((a) => a.includes(" ") ? `"${a}"` : a).join(" ")}` : command;
-        const message = `The command \`${fullCommand}\` exited with code ${e.exitCode}`;
-        const newError = new Error(message, e.cause ? { cause: e.cause } : void 0);
-        newError.stderr = e.output?.stderr;
-        newError.stdout = e.output?.stdout;
-        throw newError;
-      }
-      throw e;
-    }
-  );
-}
-export {
-  exec
-};