Fix incorrect HTML tag by replacing small element with sup and sub tags

Author: robertpiosik

README.md

@@ -14,7 +14,7 @@
 
 Code Web Chat is a free and open-source AI coding toolkit **designed for speed and privacy**. You can use CWC in **VS Code** family of editors (Cursor, Antigravity, VSCodium, etc.) for a **much faster\*** development experience.
 
-<small>\* Compared to coding agents.</small>
+<sup>\* Compared to coding agents.</sub>
 
 ✍️ **Construct coding prompts for...**