docs(README): update repository title and description

- Change repository title from "Flutter News App - Mobile Client Full Source Code" to "Flutter News App Mobile Client Full Source Code"
- Remove redundant hyphen for consistency and brevity

Author: fulleni

README.md

@@ -1,7 +1,7 @@
 <div align="center">
 <img src="https://avatars.githubusercontent.com/u/202675624?s=400&u=dc72a2b53e8158956a3b672f8e52e39394b6b610&v=4" alt="Flutter News App Toolkit Logo" width="220">
 
-# Flutter News App - Mobile Client Full Source Code
+# Flutter News App Mobile Client Full Source Code
 
 <p>
 <img src="https://img.shields.io/badge/coverage-0%25-green?style=for-the-badge" alt="coverage: 0%">