Improve formatting and clarity of License section

Promoted license section to a top-level heading.
Consolidated license descriptions for source code and graphical assets.
Enhanced readability and link presentation.

Author: RafaelJohn9

README.md

@@ -286,8 +286,7 @@ To add a new GUI client to the [list of GUI clients](https://git-scm.com/downloa
 
 ---
 
-The source code for the site is licensed under the MIT license, which you can find in
-the MIT-LICENSE.txt file.
+## License
 
-All graphical assets are licensed under the
-[Creative Commons Attribution 3.0 Unported License](https://creativecommons.org/licenses/by/3.0/).
+The source code for this site is licensed under the MIT license (see `MIT-LICENSE.txt`).  
+All graphical assets are licensed under the [Creative Commons Attribution 3.0 Unported License](https://creativecommons.org/licenses/by/3.0/).