dApp chain selector

[nicosampler]

I propose adding a select to the landing page to indicate the chain the app is pointing to.

This component is really important for the user, to know the context of the data the dapp is showing.

[fernandomg]

@nicosampler how does this differ from what we have?

Can you elaborate a little more?

Also, shouldn't this issue be transferred to the dAppBoosterLandingPage project?

[nicosampler]

When a user clones the dAppBooster and runs the dapp, the header should have the network selector, as most dapps have. We should provide components that the 90% of the dApps need.

I believe it is important because it is the indicator that lets the user know from where the data is being read and where the txs are going to be sent.