Promote nikos to rank I

Replacement for https://collectives.subsquare.io/fellowship/referenda/46 which failed after the runtime upgrade.

This is a fellowship referendum, open to voting by rank III and above, to promote Nikos to rank I. Please find his proposal writing here.

Good luck Nikos! :)

(I believe this is the first proposal using the new fellowship-core pallet 🥳)