⚡️ Added DeDust and STON.fi cookbooks to the documentation

Ever wondered how to build your own Decentralized EXchange? Neither have I!

However, documentation on how to interact with existing DEXes from Tact was highly requested — and, with the help of community contributors, we wrote it. Read how to swap Toncoins for Jettons, Jettons for Jettons, and provide liquidity to pools of DeDust and STON.fi, all with ⚡️ Tact.

🧑‍🍳🎉 Community contributors: PixelPlex and Aliaksandr Bahdanau
🐙 Implementations: #954, #956
✈️ Delivered: DeDust, STON.fi

🍲 decentralized surprise liquidity provision
♨️ @tact_kitchen