♻️ 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/micromark-extension-gfm-table/dev/index.d.ts

@@ -1,55 +0,0 @@
-import type {Align} from './lib/infer.js'
-
-export {gfmTableHtml} from './lib/html.js'
-export {gfmTable} from './lib/syntax.js'
-
-/**
- * Augment types.
- */
-declare module 'micromark-util-types' {
-  /**
-   * State tracked to compile events as HTML,
-   * extended by `micromark-extension-gfm-table`.
-   */
-  interface CompileData {
-    /**
-     * Alignment of current table.
-     */
-    tableAlign?: Array<Align> | undefined
-    /**
-     * Current table column.
-     */
-    tableColumn?: number | undefined
-  }
-
-  /**
-   * Augment token;
-   * `align` is patched on `table` tokens by
-   * `micromark-extension-gfm-table`.
-   */
-  interface Token {
-    /**
-     * Alignment of current table.
-     */
-    _align?: Array<Align> | undefined
-  }
-
-  /**
-   * Map of allowed token types,
-   * extended by `micromark-extension-gfm-table`.
-   */
-  interface TokenTypeMap {
-    tableBody: 'tableBody'
-    tableCellDivider: 'tableCellDivider'
-    tableContent: 'tableContent'
-    tableData: 'tableData'
-    tableDelimiterFiller: 'tableDelimiterFiller'
-    tableDelimiterMarker: 'tableDelimiterMarker'
-    tableDelimiterRow: 'tableDelimiterRow'
-    tableDelimiter: 'tableDelimiter'
-    tableHeader: 'tableHeader'
-    tableHead: 'tableHead'
-    tableRow: 'tableRow'
-    table: 'table'
-  }
-}