[ESC-340] Fix Underline on text block

Walkthrough

The changes in this pull request involve updating the configuration for HTMLPurifier in the api/config/purify.php file. The main modification is the inclusion of the <u> HTML element in the HTML.Allowed configuration, allowing underlined text to be preserved during the HTML filtering process. Other settings in the configuration remain unchanged.

Changes

File	Change Summary
api/config/purify.php	Updated `HTML.Allowed` to include the `<u>` tag, allowing underlined text in the filtered output.

Assessment against linked issues

Objective	Addressed	Explanation
Retain underline formatting in text blocks (#593)	✅

🐰 In the garden where words take flight,
Underlines dance in the soft moonlight.
With a flick of a tag, they twirl and play,
Saving the magic, come what may!
Hooray for the changes, let the text shine bright! 🌟

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