Release ERC-7715 docs

* release 7715 docs

* update flask version

* remove old versions

* update sidebar

* add 7715 concept page

Author: AyushBherwani1998

delegation-toolkit/concepts/erc7715.md

@@ -13,7 +13,7 @@ ERC-7715 eliminates the need for users to approve every transaction, which is us
 It also enables dapps to execute transactions for users without an active wallet connection.
 
 :::note
-This feature requires [MetaMask Flask 12.14.2](/snaps/get-started/install-flask) or later.
+This feature requires [MetaMask Flask 13.5.0](/snaps/get-started/install-flask) or later.
 :::
 
 ## ERC-7715 technical overview

delegation-toolkit/experimental/erc-7715-request-permissions.md

@@ -9,7 +9,7 @@ import TabItem from "@theme/TabItem";
 
 :::caution Experimental
 This is an experimental feature.
-It requires MetaMask Flask 12.14.2 or later, and may change in future releases.
+It requires MetaMask Flask 13.5.0 or later, and may change in future releases.
 :::
 
 [ERC-7715](https://eip.tools/eip/7715) introduces a standard way for dapps to request permissions from a wallet to execute

delegation-toolkit/guides/erc7715/execute-on-metamask-users-behalf.md

@@ -19,7 +19,7 @@ In this guide, you'll request an ERC-20 periodic transfer permission from a Meta
 ## Prerequisites
 
 - [Install and set up the Delegation Toolkit.](../../get-started/install.md)
-- [Install MetaMask Flask 12.14.2 or later.](/snaps/get-started/install-flask)
+- [Install MetaMask Flask 13.5.0 or later.](/snaps/get-started/install-flask)
 
 ### 1. Set up a Wallet Client