add banner develop/smart contract

Author: 0xlukem

develop/smart-contracts/block-explorers/index.md

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 The following block explorers are available for PolkaVM smart contracts, providing specialized tools for monitoring and analyzing contract activity within the Polkadot ecosystem:
 
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 <!-- ### Subscan
 
 Subscan is the flagship Polkadot ecosystem block explorer with comprehensive support for PolkaVM smart contracts. It provides robust transaction indexing, account analysis, and monitoring tools specifically optimized for Polkadot SDK-based networks.

develop/smart-contracts/faqs.md

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 Polkadot Hub uses [PolkaVM](/polkadot-protocol/smart-contract-basics/polkavm-design){target=\_blank} instead of traditional EVM:
 
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 - **Performance**: RISC-V register-based architecture vs. stack-based EVM.
 - **Resource metering**: Three dimensions (`ref_time`, `proof_size`, `storage_deposit`) vs. single gas metric.
 - **Memory management**: Hard memory limits per contract vs. gas-based soft limits.

develop/smart-contracts/index.md

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 [timeline(polkadot-docs/.snippets/text/develop/smart-contracts/index/index-timeline.json)]
 
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 ## Additional Resources
 <div class="grid cards" markdown>
 

develop/smart-contracts/libraries/viem.md

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 Install viem along with other necessary dependencies, including [@parity/revive](https://www.npmjs.com/package/@parity/revive){target=\_blank}, which enables to compile smart contracts to [PolkaVM](/polkadot-protocol/smart-contract-basics/polkavm-design/#polkavm){target=\_blank} bytecode:
 
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 ```bash
 # Install viem and Revive
 npm install viem @parity/revive

develop/smart-contracts/libraries/web3-js.md

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 Polkadot Hub requires contracts to be compiled to [PolkaVM](/polkadot-protocol/smart-contract-basics/polkavm-design/){target=\_blank} bytecode. This is achieved using the [`revive`](https://github.com/paritytech/revive){target=\_blank} compiler. Install the [`@parity/revive`](https://github.com/paritytech/js-revive){target=\_blank} library as a development dependency:
 
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 ```bash
 npm install --save-dev @parity/revive
 ```

develop/smart-contracts/libraries/web3-py.md

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 - An ABI (.json) file, which provides a JSON interface describing the contract's functions and how to interact with it
 - A bytecode (.polkavm) file, which contains the low-level machine code executable on [PolkaVM](/polkadot-protocol/smart-contract-basics/polkavm-design#polkavm){target=\_blank} that represents the compiled smart contract ready for blockchain deployment
 
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 To follow this guide, you can use the following solidity contract as an example:
 
 ```solidity title="Storage.sol"

develop/smart-contracts/overview.md

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 Polkadot Hub enables smart contract deployment and execution through PolkaVM, a cutting-edge virtual machine designed specifically for the Polkadot ecosystem. This native integration allows developers to deploy smart contracts directly on Polkadot's system chain while maintaining compatibility with Ethereum development tools and workflows.
 
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 ### Smart Contract Development
 
 The smart contract platform on Polkadot Hub combines _Polkadot's robust security and scalability_ with the extensive Ethereum development ecosystem. Developers can utilize familiar Ethereum libraries for contract interactions and leverage industry-standard development environments for writing and testing smart contracts.

develop/smart-contracts/precompiles/index.md

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     classDef edgeLabel background:#eceff3;
 ```
 
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 ## Standard Precompiles in Polkadot Hub
 
 Revive implements the standard set of Ethereum precompiles: