docs: add sponsor call-to-action to READMEs and fix FUNDING.yml

.github/FUNDING.yml

@@ -1,2 +1,2 @@
 custom:
-  - mailto:farion1231@gmail.com
+  - https://github.com/farion1231/cc-switch#%EF%B8%8Fsponsor

README.md

@@ -17,6 +17,8 @@ English | [中文](README_ZH.md) | [日本語](README_JA.md) | [Changelog](CHANG
 
 ## ❤️Sponsor
 
+> [Want to appear here?](mailto:farion1231@gmail.com)
+
 <details open>
 <summary>Click to collapse</summary>
 

README_JA.md

@@ -17,6 +17,8 @@
 
 ## ❤️スポンサー
 
+> [ここに掲載しませんか？](mailto:farion1231@gmail.com)
+
 <details open>
 <summary>クリックで折りたたむ</summary>
 

README_ZH.md

@@ -17,6 +17,8 @@
 
 ## ❤️赞助商
 
+> [想出现在这里？](mailto:farion1231@gmail.com)
+
 <details open>
 <summary>点击折叠</summary>