Agents.jl examples plot in the highlight section should be regenerated

[Tortar]

here https://juliadynamics.github.io/Agents.jl/stable/#Highlights the plotting of flocking is wrong because there was a bug in behaviour, I fixed it sometime ago, but we didn't regenerate this plot

[Datseris]

The file that did the original animation is here: https://github.com/JuliaDynamics/Agents.jl/blob/main/docs/logo/example_zoo.jl