Customizing the html generated from Chart to_html( io::IO, p::Plot; autoplay::Bool=true, include_plotlyjs::Union{String,Missing}="cdn", include_mathjax::Union{String,Missing}="cdn", post_script::Union{String,Missing}=missing, full_html::Bool=true, animation_opts::Union{Dict,Missing}=missing, default_width::String="100%", default_height::String="100%" )