Revert "Add ERC20 preset (#810)"

This reverts commit 7a7be63.

docs/modules/ROOT/pages/api/erc20.adoc

@@ -168,7 +168,7 @@ use openzeppelin::token::erc20::ERC20Component;
 ```
 ERC20 component extending <<IERC20,IERC20>> and <<IERC20Metadata,IERC20Metadata>>.
 
-[.contract-index#ERC20Component-Embeddable-Impls]
+[.contract-index]
 .Embeddable implementations
 --
 .ERC20Impl
@@ -189,7 +189,7 @@ ERC20 component extending <<IERC20,IERC20>> and <<IERC20Metadata,IERC20Metadata>
 * xref:#ERC20Component-decrease_allowance[`++decrease_allowance(self, spender, subtracted_value)++`]
 --
 
-[.contract-index#ERC20Component-Embeddable-Impls-camelCase]
+[.contract-index]
 .Embeddable implementations (camelCase)
 --
 .ERC20CamelOnlyImpl
@@ -471,43 +471,3 @@ See <<IERC20-Transfer,IERC20::Transfer>>.
 ==== `[.contract-item-name]#++Approval++#++(owner: ContractAddress, spender: ContractAddress, value: u256)++` [.item-kind]#event#
 
 See <<IERC20-Approval,IERC20::Approval>>.
-
-== Presets
-
-[.contract]
-[[ERC20]]
-=== `++ERC20++` link:https://github.com/OpenZeppelin/cairo-contracts/blob/release-v0.8.0-beta.0/src/presets/erc20.cairo[{github-icon},role=heading-link]
-
-```javascript
-use openzeppelin::presets::ERC20;
-```
-
-Basic ERC20 contract leveraging xref:#ERC20Component[ERC20Component] with a fixed-supply mechanism for token distribution.
-
-[.contract-index]
-.Constructor
---
-* xref:#ERC20-constructor[`++constructor(self, name, symbol, fixed_supply, recipient)++`]
---
-
-[.contract-index]
-.Embedded Implementations
---
-.ERC20Component
-
-* xref:#ERC20Component-Embeddable-Impls[`++ERC20Impl++`]
-* xref:#ERC20Component-Embeddable-Impls[`++ERC20MetadataImpl++`]
-* xref:#ERC20Component-Embeddable-Impls[`++SafeAllowanceImpl++`]
-* xref:#ERC20Component-Embeddable-Impls-camelCase[`++ERC20CamelOnlyImpl++`]
-* xref:#ERC20Component-Embeddable-Impls-camelCase[`++SafeAllowanceCamelImpl++`]
---
-
-[#ERC20-constructor-section]
-==== Constructor
-
-[.contract-item]
-[[ERC20-constructor]]
-==== `[.contract-item-name]#++constructor++#++(ref self: ContractState, name: felt252, symbol: felt252, fixed_supply: u256, recipient: ContractAddress)++` [.item-kind]#constructor#
-
-Sets the `name` and `symbol`.
-Mints `fixed_supply` tokens to `recipient`.

docs/modules/ROOT/pages/guides/erc20-supply.adoc

@@ -42,20 +42,20 @@ mod MyToken {
     #[constructor]
     fn constructor(
         ref self: ContractState,
-        fixed_supply: u256,
+        initial_supply: u256,
         recipient: ContractAddress
     ) {
         let name = 'MyToken';
         let symbol = 'MTK';
 
         self.erc20.initializer(name, symbol);
-        self.erc20._mint(recipient, fixed_supply);
+        self.erc20._mint(recipient, initial_supply);
     }
 }
 ----
 
 In the constructor, we're first calling the ERC20 initializer to set the token name and symbol.
-Next, we're calling the internal `_mint` function which creates `fixed_supply` of tokens and allocates them to `recipient`.
+Next, we're calling the internal `_mint` function which creates `initial_supply` of tokens and allocates them to `recipient`.
 Since the internal `_mint` is not exposed in our contract, it will not be possible to create any more tokens.
 In other words, we've implemented a fixed token supply!
 

src/presets.cairo

@@ -1,5 +1,3 @@
 mod account;
-mod erc20;
 
 use account::Account;
-use erc20::ERC20;

src/tests/presets.cairo

@@ -1,2 +1 @@
 mod test_account;
-mod test_erc20;