♻️ 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/mdast-util-to-markdown/lib/handle/thematic-break.js

@@ -1,21 +0,0 @@
-/**
- * @import {State} from 'mdast-util-to-markdown'
- * @import {Parents, ThematicBreak} from 'mdast'
- */
-
-import {checkRuleRepetition} from '../util/check-rule-repetition.js'
-import {checkRule} from '../util/check-rule.js'
-
-/**
- * @param {ThematicBreak} _
- * @param {Parents | undefined} _1
- * @param {State} state
- * @returns {string}
- */
-export function thematicBreak(_, _1, state) {
-  const value = (
-    checkRule(state) + (state.options.ruleSpaces ? ' ' : '')
-  ).repeat(checkRuleRepetition(state))
-
-  return state.options.ruleSpaces ? value.slice(0, -1) : value
-}