Feature Request: Add support for using a unicode character to specify the icon to use for a page

[ApolonTorq]

Unicode contains a wide variety of standardized icons. In addition to being able to specify Retype Moji and Octicon icons, it would be useful to use a single Unicode character in the frontmatter of a page. See below for an example. It expands the range of icons available for use without needing to take a dependency on another external package.

It would be also useful to apply this support to all scenarios where Moji and Octicon icons can be specified.

---
title: "Asking for help on a documentation convention"
date: 2025-09-19
icon: ✨
---