Refactor development page and enhance translations for improved clarity

- Consolidate the "Web Development" link in the navigation for better structure.
- Add an introductory text to the development section in translations for clearer context.
- Update various translation entries for consistency and clarity across multiple languages.
- Remove the development.astro page as its functionality is now integrated elsewhere.

src/pages/[lang]/development.astro

@@ -1,10 +1,10 @@
 ---
-import Layout from '../layouts/PageLayout.astro';
-import { getPermalink } from '../utils/permalinks';
-import { getTranslation } from '../i18n/translations';
+import Layout from '../../layouts/PageLayout.astro';
+import { getPermalink } from '../../utils/permalinks';
+import { getTranslation } from '../../i18n/translations';
 import React, { useMemo } from 'react';
 import dynamic from 'astro/dynamic';
-import ContributionCalendar from '../components/ContributionCalendar.jsx';
+import ContributionCalendar from '../../components/ContributionCalendar.jsx';
 
 const metadata = {
   title: 'Development Progress | 365DevNet',
@@ -68,7 +68,7 @@ const contributionData = getContributionData(commits);
   <div class="max-w-4xl mx-auto px-4 py-8">
     <h1 class="text-4xl font-bold mb-4">{t.development.title || 'Development Progress'}</h1>
     <p class="mb-8 text-lg text-gray-700 dark:text-gray-300">
-      This page provides a transparent overview of the ongoing development activity for the <strong>365DevNet</strong> project. The contribution calendar below visually represents code contributions (commits) made over the past year, with darker squares indicating more active days. Below the calendar, you'll find a list of the most recent commits, including details about each change. This helps users, contributors, and stakeholders track project progress and stay up to date with the latest updates.
+      {t.development.intro}
     </p>
     {/* Contribution Calendar */}
     <div class="mb-8">