Remove Tachyswap (#199)

* Remove Tachyswap

* Use IguanaDEX instead

docs/building-on-etherlink/tokens.mdx

@@ -5,7 +5,7 @@ title: Tokens
 import InlineCopy from '@site/src/components/InlineCopy';
 
 The native coin on Etherlink has the symbol XTZ, like the [tez tokens on Tezos layer 1](https://docs.tezos.com/architecture/tokens).
-You can get XTZ from many exchanges and applications including [TachySwap](https://app.tachyswap.org).
+You can get XTZ from many exchanges and applications including [IguanaDEX](https://www.iguanadex.com/?chain=etherlink).
 
 Etherlink provides a wrapped version of XTZ named WXTZ that is an [ERC-20-compliant](https://ethereum.org/en/developers/docs/standards/tokens/erc-20/) token for ease of interacting with decentralized applications.
 For more information about WXTZ, see [WXTZ](#wxtz).