Description and extra fields don't escape HTML code

[arielj]

Branch/Commit:

Main branch.

Expected behavior:

When writing html code like <h1>Something</h1> I think it's expected for the tags to show as text, not to proces that as a real <h1> tag.

Actual behavior:

HTML is unescaped and can lead to unexpected problems if tags are not properly closed or the code is not contained properly.

In this screenshot, I added some style and that red div is outside the preview area, this shouldn't be possible:

We have to figure out if we can allow only markdown syntax to be parsed and any html to be escaped

Steps to reproduce:

1. Go to add or edit a story
2. Type some html

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