♻️ 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

✅ 11 pages built successfully
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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/mdast-util-to-markdown/lib/handle/image-reference.js

@@ -1,63 +0,0 @@
-/**
- * @import {Info, State} from 'mdast-util-to-markdown'
- * @import {ImageReference, Parents} from 'mdast'
- */
-
-imageReference.peek = imageReferencePeek
-
-/**
- * @param {ImageReference} node
- * @param {Parents | undefined} _
- * @param {State} state
- * @param {Info} info
- * @returns {string}
- */
-export function imageReference(node, _, state, info) {
-  const type = node.referenceType
-  const exit = state.enter('imageReference')
-  let subexit = state.enter('label')
-  const tracker = state.createTracker(info)
-  let value = tracker.move('![')
-  const alt = state.safe(node.alt, {
-    before: value,
-    after: ']',
-    ...tracker.current()
-  })
-  value += tracker.move(alt + '][')
-
-  subexit()
-  // Hide the fact that we’re in phrasing, because escapes don’t work.
-  const stack = state.stack
-  state.stack = []
-  subexit = state.enter('reference')
-  // Note: for proper tracking, we should reset the output positions when we end
-  // up making a `shortcut` reference, because then there is no brace output.
-  // Practically, in that case, there is no content, so it doesn’t matter that
-  // we’ve tracked one too many characters.
-  const reference = state.safe(state.associationId(node), {
-    before: value,
-    after: ']',
-    ...tracker.current()
-  })
-  subexit()
-  state.stack = stack
-  exit()
-
-  if (type === 'full' || !alt || alt !== reference) {
-    value += tracker.move(reference + ']')
-  } else if (type === 'shortcut') {
-    // Remove the unwanted `[`.
-    value = value.slice(0, -1)
-  } else {
-    value += tracker.move(']')
-  }
-
-  return value
-}
-
-/**
- * @returns {string}
- */
-function imageReferencePeek() {
-  return '!'
-}