♻️ 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/prompts/lib/dateparts/day.js

@@ -1,42 +0,0 @@
-'use strict';
-
-const DatePart = require('./datepart');
-
-const pos = n => {
-  n = n % 10;
-  return n === 1 ? 'st'
-       : n === 2 ? 'nd'
-       : n === 3 ? 'rd'
-       : 'th';
-}
-
-class Day extends DatePart {
-  constructor(opts={}) {
-    super(opts);
-  }
-
-  up() {
-    this.date.setDate(this.date.getDate() + 1);
-  }
-
-  down() {
-    this.date.setDate(this.date.getDate() - 1);
-  }
-
-  setTo(val) {
-    this.date.setDate(parseInt(val.substr(-2)));
-  }
-
-  toString() {
-    let date = this.date.getDate();
-    let day = this.date.getDay();
-    return this.token === 'DD' ? String(date).padStart(2, '0')
-         : this.token === 'Do' ? date + pos(date)
-         : this.token === 'd' ? day + 1
-         : this.token === 'ddd' ? this.locales.weekdaysShort[day]
-         : this.token === 'dddd' ? this.locales.weekdays[day]
-         : date;
-  }
-}
-
-module.exports = Day;