tweak standard visualizations to support page front matter

[evanwill]

includes use theme values by default, but the same values can be set in page front matter (which over rides theme values), making it easier to set up custom additional pages

[maehr]

Hi @evanwill we couldn't figure out exactly what you mean by your issue. Could you please elaborate with more details?

[evanwill]

@maehr if you look at the "pages/locations.md" and "pages/subjects.md", the front matter sets the values used for the "cloud" layout, and all options for the visualization are supported by adding front matter to a page with the layout cloud (see cloud docs). This makes it easy to set up new cloud pages in a variety of ways, without needing to mess around with the layout.
I would like the "map", "data", "timeline", and maybe "browse" to work in a similar way so you can create custom versions without messing around with setting up new layouts. I am not exactly sure which all options would be supported yet.

[evanwill]

I guess there is a more specific version of this related to the map layout in with an example #78