Better describe the use case of wasp

[Dr-Electron]

Describe the solution you'd like

We should make it clear what wasp is for, what the next steps to using it are and so on.
Currently there is no reason for 99% of people to run a wasp node. There might be one once access nodes are possible or the need for other chains come up, but we need to make sure that running wasp alone makes no sense, which currently seems to happen