docs: remove extended description of offsethelper from readme

This description is in the contract's natspec and not be duplicated

Author: danceratopz

README.md

@@ -10,21 +10,9 @@ A collection of Solidity contract examples that implement, integrate with or dem
 
 ## OffsetHelper
 
-The `OffsetHelper` contract implements helper functions that simplify the carbon offsetting (retirement) process. Retiring carbon tokens normally requires multiple steps and interactions with Toucan Protocol's main contracts:
-1. Obtain a Toucan pool token such as BCT or NCT (by performing a token swap).
-2. Redeem the pool token for a TCO2 token.
-3. Retire the TCO2 token.
+The `OffsetHelper` contract implements helper functions that simplify the carbon offsetting (retirement) process.
 
-These steps are combined in each of the following "auto offset" methods implemented in `OffsetHelper` to allow a retirement within one transaction:
-- `autoOffsetUsingPoolToken()` if the user has already owns a Toucan pool token such as BCT or NCT,
-- `autoOffsetUsingETH()` if the user would like to perform a retirement using MATIC,
-- `autoOffsetUsingToken()` if the user would like to perform a retirement using an ERC20 token: USDC, WETH or WMATIC.
-
-In these methods, "auto" refers to the fact that these methods use `autoRedeem` in order to automatically choose a TCO2 token corresponding to the oldest tokenized carbon project in the specfified token pool. There are no fees incurred by the user when using `autoRedeem`.
-
-There are two read helper functions `calculateNeededETHAmount()` and `calculateNeededTokenAmount()` that can be used before calling `autoOffsetUsingETH()` and `autoOffsetUsingToken()`, to determine how MATIC, respectively how much of the ERC20 token must be sent to the `OffsetHelper` contract in order to retire the specified amount of carbon. 
-
-See [./docs/OffsetHelper.md](./docs/OffsetHelper.md) for detailed documentation of these and other methods from the contract.
+See [./docs/OffsetHelper.md](./docs/OffsetHelper.md) for detailed documentation.
 
 ### Development