Fix Chawan URL (rothgar#423)

The link pointed to an unofficial mirror; this changes it to the official
website.

Author: bptato

README.md

@@ -633,7 +633,7 @@
 - [carbonyl](https://github.com/fathyb/carbonyl) Chromium running inside your terminal
 - [castero](https://github.com/xgi/castero) A TUI app to listen to podcast
 - [CatenaVetus](https://github.com/jimbob88/CatenaVetus) A TUI for reading the Church Fathers
-- [Chawan](https://github.com/sourcehut-mirrors/chawan) A TUI web (and (S)FTP, Gopher, Gemini) browser with CSS, inline image and JavaScript support.
+- [Chawan](https://chawan.net) A TUI web (and (S)FTP, Gopher, Gemini) browser with CSS, inline image and JavaScript support.
 - [elinks](https://github.com/rkd77/elinks) ELinks (HTTP/FTP/..) brower with mujs javascript support.
 - [hackernews-TUI](https://github.com/aome510/hackernews-TUI) A Terminal UI to browse Hacker News
 - [haxor-news](https://github.com/donnemartin/haxor-news) Browse Hacker News like a haxor: A Hacker News command line interface (CLI)