♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

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

dealplustech-astro/node_modules/hast-util-whitespace/lib/index.d.ts

@@ -1,13 +0,0 @@
-/**
- * Check if the given value is *inter-element whitespace*.
- *
- * @param {Nodes | string} thing
- *   Thing to check (`Node` or `string`).
- * @returns {boolean}
- *   Whether the `value` is inter-element whitespace (`boolean`): consisting of
- *   zero or more of space, tab (`\t`), line feed (`\n`), carriage return
- *   (`\r`), or form feed (`\f`); if a node is passed it must be a `Text` node,
- *   whose `value` field is checked.
- */
-export function whitespace(thing: Nodes | string): boolean;
-export type Nodes = import('hast').Nodes;