Remove donation section from README

Removed donation section from README.

Author: beacoder

README.org

@@ -70,14 +70,3 @@ Install =stock-tracker= from [[http://melpa.org/][MELPA]] with:
 ** License
 
 [[file:LICENSE][MIT LICENSE]]. Copyright (c) 2019-2025 Huming Chen <chenhuming@gmail.com>
-
-** Donate
-
-If you think that it's helpful for you, please consider paying a cup of coffee
-for me. Thank you! :smile:
-
-[[file:WeChatQR.jpg]]
-
-@@html:<a href="https://www.buymeacoffee.com/s9giES1" target="_blank">@@
-@@html:<img src="https://cdn.buymeacoffee.com/buttons/default-orange.png" alt="Buy Me A Coffee" width="160"/>@@
-@@html:</a>@@