♻️ 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/import-meta-resolve/lib/utils.js

@@ -1,47 +0,0 @@
-// Manually “tree shaken” from:
-// <https://github.com/nodejs/node/blob/81a9a97/lib/internal/modules/esm/utils.js>
-// Last checked on: Apr 29, 2024.
-
-import {codes} from './errors.js'
-
-const {ERR_INVALID_ARG_VALUE} = codes
-
-// In Node itself these values are populated from CLI arguments, before any
-// user code runs.
-// Here we just define the defaults.
-const DEFAULT_CONDITIONS = Object.freeze(['node', 'import'])
-const DEFAULT_CONDITIONS_SET = new Set(DEFAULT_CONDITIONS)
-
-/**
- * Returns the default conditions for ES module loading.
- */
-function getDefaultConditions() {
-  return DEFAULT_CONDITIONS
-}
-
-/**
- * Returns the default conditions for ES module loading, as a Set.
- */
-function getDefaultConditionsSet() {
-  return DEFAULT_CONDITIONS_SET
-}
-
-/**
- * @param {Array<string>} [conditions]
- * @returns {Set<string>}
- */
-export function getConditionsSet(conditions) {
-  if (conditions !== undefined && conditions !== getDefaultConditions()) {
-    if (!Array.isArray(conditions)) {
-      throw new ERR_INVALID_ARG_VALUE(
-        'conditions',
-        conditions,
-        'expected an array'
-      )
-    }
-
-    return new Set(conditions)
-  }
-
-  return getDefaultConditionsSet()
-}