add logo to readme

Author: nmorgan-cb

based/README.md

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 # all your base are belong to you.
 
+<p><img src="./base.jpeg"/></p>
+
 This guide is intended to act as a tour of the Base ecosystem in order to help
 with technical ramping to the protocol. It is intended to be a crash course moving
 through major topics, providing links to articles and tutorials to help filter out

based/base.jpeg

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 # Base
 
-<p><img src="./Base_Wordmark_Blue.svg"/>
+<p><img src="./Base_Wordmark_Blue.svg"/></p>
 
 Now that we’ve covered core features of Ethereum as well as how Solidity and
 Smart Contract development works, we can dive into learning about Base. To get

based/base/index.md

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 # Blockchain Basics
 
-<p><img src="./whatisablockchain.png"/>
+<p><img src="./whatisablockchain.png"/></p>
 
 Blockchains are complex. The technology that makes them work is a result of
 decades of innovation across several disciplines. To understand how we got to

based/blockchain-basics/index.md

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 # Ethereum
 
-<p><img width="61.4" height="100" src="./eth-diamond-purple.png"/>
+<p><img width="61.4" height="100" src="./eth-diamond-purple.png"/></p>
 
 Base is a layer 2 (L2) blockchain network built on top of Ethereum. In order to
 understand how the L2 rollup works, you need to have a good understanding of how

based/ethereum/index.md

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 # Smart Contracts and Solidity
 
-<p><img src="./logo.svg"/>
+<p><img src="./logo.svg"/></p>
 
 Smart Contracts are coded contracts deployed onto a blockchain network. These
 contracts are immutable and transactions executed on a smart contract are