add next js example

[eyberg]

something to do with the symlink, which I haven't looked more into yet but essentially you want something like

"Args" : ["node", "/node_modules/next/dist/bin/next", "start"

vs

"Args" : ["node", "/node_modules/.next//bin/next", "start"

(at least for creating a pkg - for just a pkg load w/node it seems to not care ...)

[eyberg]

https://github.com/nanovms/ops-examples/pull/130