chore: reuse reference link to Bot API

Author: evermake

README.md

@@ -2,7 +2,7 @@
 [![npm](https://img.shields.io/npm/v/%40grom.js%2Fbot-api-spec?style=flat&logo=npm&logoColor=%23BB443E&logoSize=auto&label=%C2%A0&labelColor=%23fff&color=%23BB443E)](https://www.npmjs.com/package/@grom.js/tgx)
 [![jsr](https://img.shields.io/jsr/v/%40grom/bot-api-spec?style=flat&logo=jsr&logoColor=%231B3646&logoSize=auto&label=%C2%A0&labelColor=%23F3E051&color=%231B3646)](https://jsr.io/@grom/tgx)
 
-[Telegram Bot API](https://core.telegram.org/bots/api) specification as a collection of JavaScript objects in a [custom format](#format).
+[Telegram Bot API][bot-api] specification as a collection of JavaScript objects in a [custom format](#format).
 
 ## Motivation