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The hestia_pagination() function in inc/template-tags.php should be replaced with the core the_posts_pagination() function.

See: https://developer.wordpress.org/reference/functions/the_posts_pagination/

You can customizer the markup via this hook: https://developer.wordpress.org/reference/hooks/navigation_markup_template/

If what you want to do can't be accomplished with the core functions and hooks, be sure to make a note of that explaining it in your inline PHP comments accompanying the function. It'll help the .ORG reviewers know you need to do something custom.

Otherwise, I strongly recommend using the core function.