♻️ 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/vfile-location/index.d.ts

@@ -1,47 +0,0 @@
-import type {Point as UnistPoint} from 'unist'
-
-export {location} from './lib/index.js'
-
-/**
- * Accessors for index.
- */
-export interface Location {
-  /**
-   * Get the `offset` from a line/column based `Point` in the bound indices;
-   * returns `undefined` when given out of bounds input.
-   *
-   * @param point
-   *   Line/column based `Point`.
-   * @returns
-   *   Offset.
-   */
-  toOffset(point?: PointLike | null | undefined): number | undefined
-  /**
-   * Get the line/column based `Point` for `offset` in the bound indices;
-   * returns `undefined` when given out of bounds input.
-   *
-   * @param offset
-   *   Offset.
-   * @returns
-   *   `Point`.
-   */
-  toPoint(offset?: number | null | undefined): UnistPoint | undefined
-}
-
-/**
- * Point from `unist`, allowed as input.
- */
-interface PointLike {
-  /**
-   * Column.
-   */
-  column?: number | null | undefined
-  /**
-   * Line.
-   */
-  line?: number | null | undefined
-  /**
-   * Offset.
-   */
-  offset?: number | null | undefined
-}