♻️ 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/p-queue/dist/lower-bound.js

@@ -1,18 +0,0 @@
-// Port of lower_bound from https://en.cppreference.com/w/cpp/algorithm/lower_bound
-// Used to compute insertion index to keep queue sorted after insertion
-export default function lowerBound(array, value, comparator) {
-    let first = 0;
-    let count = array.length;
-    while (count > 0) {
-        const step = Math.trunc(count / 2);
-        let it = first + step;
-        if (comparator(array[it], value) <= 0) {
-            first = ++it;
-            count -= step + 1;
-        }
-        else {
-            count = step;
-        }
-    }
-    return first;
-}