♻️ 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/heading.js

@@ -1,75 +0,0 @@
-/**
- * @import {Info, State} from 'mdast-util-to-markdown'
- * @import {Heading, Parents} from 'mdast'
- */
-
-import {encodeCharacterReference} from '../util/encode-character-reference.js'
-import {formatHeadingAsSetext} from '../util/format-heading-as-setext.js'
-
-/**
- * @param {Heading} node
- * @param {Parents | undefined} _
- * @param {State} state
- * @param {Info} info
- * @returns {string}
- */
-export function heading(node, _, state, info) {
-  const rank = Math.max(Math.min(6, node.depth || 1), 1)
-  const tracker = state.createTracker(info)
-
-  if (formatHeadingAsSetext(node, state)) {
-    const exit = state.enter('headingSetext')
-    const subexit = state.enter('phrasing')
-    const value = state.containerPhrasing(node, {
-      ...tracker.current(),
-      before: '\n',
-      after: '\n'
-    })
-    subexit()
-    exit()
-
-    return (
-      value +
-      '\n' +
-      (rank === 1 ? '=' : '-').repeat(
-        // The whole size…
-        value.length -
-          // Minus the position of the character after the last EOL (or
-          // 0 if there is none)…
-          (Math.max(value.lastIndexOf('\r'), value.lastIndexOf('\n')) + 1)
-      )
-    )
-  }
-
-  const sequence = '#'.repeat(rank)
-  const exit = state.enter('headingAtx')
-  const subexit = state.enter('phrasing')
-
-  // Note: for proper tracking, we should reset the output positions when there
-  // is no content returned, because then the space is not output.
-  // Practically, in that case, there is no content, so it doesn’t matter that
-  // we’ve tracked one too many characters.
-  tracker.move(sequence + ' ')
-
-  let value = state.containerPhrasing(node, {
-    before: '# ',
-    after: '\n',
-    ...tracker.current()
-  })
-
-  if (/^[\t ]/.test(value)) {
-    // To do: what effect has the character reference on tracking?
-    value = encodeCharacterReference(value.charCodeAt(0)) + value.slice(1)
-  }
-
-  value = value ? sequence + ' ' + value : sequence
-
-  if (state.options.closeAtx) {
-    value += ' ' + sequence
-  }
-
-  subexit()
-  exit()
-
-  return value
-}