README: split example links into separate bullets
README: split example links into separate bullets

Hopefully this makes the links really obvious.

heathn/nar-maven-plugin,maven-nar/nar-maven-plugin,Oneplus/nar-maven-plugin,manu4linux/nar-maven-plugin,eyalg1972/nar-maven-plugin,heathn/nar-maven-plugin,eyalg1972/nar-maven-plugin,Oneplus/nar-maven-plugin,Oneplus/nar-maven-plugin,dmakarov/nar-maven-plugin,maven-nar/nar-maven-plugin,heathn/nar-maven-plugin,maven-nar/nar-maven-plugin,dmakarov/nar-maven-plugin,manu4linux/nar-maven-plugin,heathn/nar-maven-plugin,dugilos/nar-maven-plugin,Oneplus/nar-maven-plugin,maven-nar/nar-maven-plugin,markjohndoyle/nar-maven-plugin,markjohndoyle/nar-maven-plugin,manu4linux/nar-maven-plugin,dugilos/nar-maven-plugin,dugilos/nar-maven-plugin,eyalg1972/nar-maven-plugin,manu4linux/nar-maven-plugin,eyalg1972/nar-maven-plugin,markjohndoyle/nar-maven-plugin,Oneplus/nar-maven-plugin,markjohndoyle/nar-maven-plugin,manu4linux/nar-maven-plugin,dugilos/nar-maven-plugin,markjohndoyle/nar-maven-plugin,dmakarov/nar-maven-plugin,heathn/nar-maven-plugin,eyalg1972/nar-maven-plugin,dmakarov/nar-maven-plugin,dmakarov/nar-maven-plugin,maven-nar/nar-maven-plugin,dugilos/nar-maven-plugin