♻️ 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/parse-latin/lib/plugin/merge-initial-digit-sentences.js

@@ -1,39 +0,0 @@
-/**
- * @typedef {import('nlcst').Paragraph} Paragraph
- */
-
-import {toString} from 'nlcst-to-string'
-import {modifyChildren} from 'unist-util-modify-children'
-import {digitStart} from '../expressions.js'
-
-// Merge a sentence into its previous sentence, when the sentence starts with a
-// lower case letter.
-export const mergeInitialDigitSentences = modifyChildren(
-  /**
-   * @type {import('unist-util-modify-children').Modifier<Paragraph>}
-   */
-  function (child, index, parent) {
-    const previous = parent.children[index - 1]
-
-    if (
-      previous &&
-      previous.type === 'SentenceNode' &&
-      child.type === 'SentenceNode'
-    ) {
-      const head = child.children[0]
-
-      if (head && head.type === 'WordNode' && digitStart.test(toString(head))) {
-        previous.children.push(...child.children)
-        parent.children.splice(index, 1)
-
-        // Update position.
-        if (previous.position && child.position) {
-          previous.position.end = child.position.end
-        }
-
-        // Next, iterate over the node *now* at the current position.
-        return index
-      }
-    }
-  }
-)