Prepare Release v1.3.0

[kawsarahmedr]

This pull request includes several updates and improvements to the Insert Codes plugin. The main changes involve correcting typos, adding new features, and updating version information.

Typo Corrections:

• Corrected the word "Bellow" to "Below" in multiple files, including includes/Admin/views/codes.php [1] includes/Admin/views/settings.php [2] and includes/Admin/views/snippets.php [3].

New Features:

• Added support for inserting CSS and JS files using the link tag in the insertcodes_get_allowed_html function in includes/functions.php.

Version Updates:

• Updated the version number from 1.2.0 to 1.3.0 in multiple files, including insert-codes.php [1] [2] languages/insert-codes.pot [3] package.json [4] and readme.txt [5].
• Updated the "Tested up to" field to WordPress version 6.7 in insert-codes.php [1] and readme.txt [2].

Changelog Update:

• Added a new entry for version 1.3.0 in readme.txt to document the new feature and compatibility update.