Adjusted the admin page to W3C standards

[gbengaoluwadahunsi]

Summary I made some changes to improve the compliance of the admin webpage with W3C standards:

Removed the obsolete frameborder attribute from iframes and added its functionality in CSS. Corrected the usage of the tag by replacing the invalid author attribute with the appropriate content attribute.

Motivation The motivation behind these changes is to ensure that the webpage adheres to modern web standards and best practices. By removing deprecated attributes and correcting invalid HTML, we aim to improve the accessibility, compatibility, and maintainability of the webpage.

Testing These changes have been tested locally and verified to produce the desired results without impacting the layout or functionality of the webpage. Additionally, the updated HTML has been validated using online HTML validation tools to ensure compliance with W3C standards.

Questions