If you want your content to be indexed by search engines or available to be
read by readers for the visually impaired, then you should use text. If you
have selected a unique font style you want to preserve, then keep your content
as an image.

Note that, if you delete your image, you may have to edit the HTML so that the
layout still works. (It depends on how complex it is.) Test the text layout
with various browser font sizes. (Use the View>Text Size option in the browser.)