feat: improve switch chain UX, add L2 networks & Zerion, refactor code

[theshadowagent]

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[vercel]

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Name	Status	Preview	Updated
nftcomponents	✅ Ready (Inspect)	Visit Preview	Oct 14, 2022 at 4:35PM (UTC)

[what-the-diff]

• Added Web3ContextProvider to wrap the app
• Moved wallet logic from MintModal component into QuantityModalStep and ConfirmTxStep components
• Added a new hook to get web3 instance and provider
• Moved the logic of getting current address from wallet.js into its own function in order for it to be used by other components as well (e.g: mint)
• Updated connectWallet() so that when user connects, we can call onConnectSuccess callback with their account address if provided
• Removed isMobileOnlyInjectedProvider parameter from initWeb3Modal since this value will always be true or false based on whether window?ethereum exists or not
  5a-b) Refactored setContracts() so that instead of passing shouldSwitchNetwork=true/false, you pass an object {shouldSwitchNetwork = true} which allows us to add more parameters later without breaking existing code using this method (i've added one already called "onNetworkSwitch" which gets called after network switch happens). This also makes it easier for users who want default behaviour but still need access to some params like chainID etc... they just have to do something like await setContracts({chainId}) instead of having multiple optional arguments passed around everywhere! :)
• The embed.html file was deleted
• The index.js file was also deleted