chore: tweak README (#5717)

Signed-off-by: boojack <stevenlgtm@gmail.com>

README.md

@@ -15,7 +15,7 @@
 
 <img align="right" height="96px" src="https://raw.githubusercontent.com/usememos/.github/refs/heads/main/assets/logo-rounded.png" alt="Memos" />
 
-An open-source, self-hosted note-taking tool. Capture thoughts instantly. Own them completely.
+Open-source, self-hosted note-taking tool built for quick capture. Markdown-native, lightweight, and fully yours.
 
 [![Home](https://img.shields.io/badge/🏠-usememos.com-blue?style=flat-square)](https://usememos.com)
 [![Live Demo](https://img.shields.io/badge/✨-Try%20Demo-orange?style=flat-square)](https://demo.usememos.com/)