Do you have a SEO plugin such as Yoast or All-in-one-SEO installed? If so how is it configured generally? How is it configured for individual pages/posts?
I notice that this issue isn’t site-wide. For example, for the page https://ruthgeorgiev.com/category/vegetarian/ you have this:
<meta data-rh="true" name="robots" content="all">
For the page https://ruthgeorgiev.com/dishes/vegetable-sides/ you have this:
<meta data-rh="true" name="robots" content="index, follow">
But for the home-page as you’ve observed you have:
<meta data-rh="true" name="robots" content="noindex,follow">
So the meta robots instruction varies depending on which page you land on. If you have a SEO plugin please check the settings for each page. The
head-tags plugin is zero-config apart from
frontity.settings.js which are already set correctly according the repo that you provided.