Implement admin dashboard to showcase monthly articles

[hariketsheth]

Implement a feature to display all articles published in a month on the Admin Dashboard.

• Add a new function getMonthlyPublishedPosts in account/welcome/function.php to fetch all articles published in a given month.
• Modify account/welcome/index.php to include a new section in the Admin Dashboard that displays all articles published in the current month.
• Add a dropdown for selecting the month and year in the Admin Dashboard.
• Use the getMonthlyPublishedPosts function to fetch and display the articles.
• Ensure the new section is only visible to users with the "Admin" role.

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