Add celoscan links for all contracts in the contracts section

[atejada]

Add celoscan links to all contract addresses and fix the layout on Token Contracts

[netlify]

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[lvpeschke]

Some addresses need to be corrected:

• For Alfajores, the Celoscan instance is at https://alfajores.celoscan.io/
• For Baklava, there is no Celoscan. The alternative is Blockscout, at https://celo-baklava.blockscout.com/. Note that Blockscout exists for all 3 networks: https://celo-alfajores.blockscout.com/ for Alfajores and https://celo.blockscout.com/ for Mainnet.