Add a packages page #147

It could be a good idea to add a section called "our packages" where we can have an explanation of some packages, what they are or how they work on dappnode. This content would help a lot to the users to understand and follow features how for example the next feature we will release like web3signer + Eth 2.0 client, how it works and what is it and more info.
This content can have more information about more packages.