fix(): webserver path should be simply localhost:3000

[Ks89]

On my mac I cannot run webserver of example 07 chapter 11, because of different network interfaces. As a web developer I suggest to simply use localhost:3000 with nodejs for development purposes.

[Ks89]

PS: i suggest to duplicate this example to create another ready for raspberry pi. In this way users could run an example on pc + arduino and another one on raspberry + arduino