remove demo link

README.md

@@ -11,8 +11,6 @@ Currently support:
 - Mandarin (from Hanyu Pinyin)
 - Vietnamese (Latin script)
 
-Demo [here](https://wunsen.up.railway.app/).
-
 ## Installation
 
 Requirement:
@@ -143,4 +141,4 @@ If we want to follow the actual transcription/transliteration system, in some ca
 
 For example, หลักเกณฑ์การทับศัพท์ภาษาเวียดนาม (ราชบัณฑิตยสถาน พ.ศ. 2555) (Vietnamese system) specifies that space in Vietnamese place names should be deleted, but in personal name, the space should still be there as in Vietnamese.
 
-Because it depends on the situation, Wunsen will leave spacing as it is.
+Because it depends on the situation, Wunsen will leave spacing as it is.