Add more things to index?

[cormullion]

I’d like to improve the indexing of colorschemes at https://juliagraphics.github.io/ColorSchemes.jl/dev/catalogue/

so that people could search for the name of a colorscheme. The browser’s Find will work, but I think adding the colorscheme names to the document index would be good.

Currently the page is constructed mainly with Julia code (https://github.com/JuliaGraphics/ColorSchemes.jl/blob/38c4cdc3f5848645d7092e8128d98bb5d6385dc0/docs/src/catalogue.md?plain=1#L35) so extra indexing stuff could be added ?🤔