Update preview image (#152)

* Update preview image

* Add gh2 to README

Author: pearmini

README.md

@@ -17,7 +17,7 @@
 
 On the one hand, we’ve always loved [Observable Notebooks](https://observablehq.com/). To explore a more portable notebook format, we created [Markdown Genji](https://genji-md.dev/), which extends Markdown with notebook-like features. Later, similar ideas appeared in [Observable Framework](https://observablehq.com/framework), and recently, [Observable Notebook Kit](https://observablehq.com/notebook-kit/) introduced an HTML-based file format. That made us wonder — could notebooks be even more portable, perhaps as a plain code file?
 
-On the other hand, we’ve always been interested in making code more accessible and playful. Inspired by the [p5.js web editor](https://editor.p5js.org/), we realized that a _well-designed language doesn’t necessarily make coding more accessible — the environment does_. The p5.js web editor achieves this, in part, through its focus on graphics. That made us wonder — could there be an environment that focuses more on computation rather than graphics, yet remains just as accessible and playful?
+On the other hand, we’ve always been interested in making code more accessible and playful. Inspired by the [p5.js web editor](https://editor.p5js.org/), we realized that a _well-designed language doesn’t necessarily make coding more accessible — the environment does_. The p5.js web editor achieves this, in part, through its focus on graphics. That made us wonder — could there be an environment that focuses more on computation rather than graphics, yet remains just as accessible and playful? One that uses ASCII art—like what we did in [gh2](https://github.com/charming-art/gh2)—when visual output is truly needed?
 
 To explore these questions, introducing Recho: **[a lighter way to code with creativity](https://medium.com/@subairui/a-lighter-way-to-code-with-creativity-8c0ac739aa6f)**. By "lighter", we mean you can have a lighter start: