Sample dApp with dapp-kit

[nwbrettski]

Need to figure out what sample dApp to create with the dapp-kit to show show case the vechain-sdk.

What features do we want to showcase?

• wallet connection
• sign and send transaction

We removed the old "create dapp" tutorial on the docs as it was outdates and not working, so we also need to create a new chapter in the docs with this example.

[nwbrettski]

Dependency on #634

[fabiorigam]

We removed the old "create dapp" tutorial on the docs as it was outdates and not working, so we also need to create a new chapter in the docs with this example.

[fabiorigam]

First complete #634