♻️ 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-lower-case-letter-sentences.js

@@ -1,52 +0,0 @@
-/**
- * @typedef {import('nlcst').Paragraph} Paragraph
- */
-
-import {toString} from 'nlcst-to-string'
-import {modifyChildren} from 'unist-util-modify-children'
-// Initial lowercase letter.
-import {lowerInitial} from '../expressions.js'
-
-// Merge a sentence into its previous sentence, when the sentence starts with a
-// lower case letter.
-export const mergeInitialLowerCaseLetterSentences = modifyChildren(
-  /**
-   * @type {import('unist-util-modify-children').Modifier<Paragraph>}
-   */
-  function (child, index, parent) {
-    if (child.type === 'SentenceNode' && index > 0) {
-      const previous = parent.children[index - 1]
-      const children = child.children
-
-      if (children.length > 0 && previous.type === 'SentenceNode') {
-        let position = -1
-
-        while (children[++position]) {
-          const node = children[position]
-
-          if (node.type === 'WordNode') {
-            if (!lowerInitial.test(toString(node))) {
-              return
-            }
-
-            previous.children.push(...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
-          }
-
-          if (node.type === 'SymbolNode' || node.type === 'PunctuationNode') {
-            return
-          }
-        }
-      }
-    }
-  }
-)