More colours for charts (and other dashboard widgets?)

### Description

The chart node config has a palette of 9 colours (of which 4 are red/brown & 4 are blue/magenta)
Once a chart has used all of these, it repeats the sequence.

With dashboard 1 there was the same palette of 9 colours, plus a fallback set of 24 (?) specified in ~/ .node-red/node_modules/node-red-dashboard/dist/js/app-min.js, and these can be augmented to get as many different colours as you might want.
`var c=(t.colors||["#1F77B4","#AEC7E8","#FF7F0E","#2CA02C","#98DF8A","#D62728","#FF9896","#9467BD","#C5B0D5"]).concat(
["#7EB3C6","#BB9A61","#3F8FB9","#57A13F","#BC5879","#6DC2DF","#D7D185","#91CA96",
"#DEB64D","#31615A","#B46E3F","#9B2FAA","#61A240","#AA3167","#9D6D5E","#3498DB",
"#EC7063","#DAF7A6","#FFC300","#D98880","#48C9B0","#7FB3D5","#F9E79F","#922B21"]
);`

Can a similar arrangement allow for more colours beyond the first nine in DB2?
A minified javascript file may not be the best place to specify them since it cannot easily be edited.
Maybe an environment variable could hold a list of colours, or else settings.js?

See [https://discourse.nodered.org/t/how-to-specify-colours-for-bar-chart/52536](url) for a discussion of the DB1 arrangement.

### Have you provided an initial effort estimate for this issue?

I can not provide an initial effort estimate

Start by locating the DB2 chart node configuration and the code that assigns its palette. Compare that behavior with the fallback colours described in app-min.js, then review whether settings.js or an environment variable is the appropriate configuration point. Done means dashboard charts and other applicable widgets can use more than the current nine colours through a documented, maintainable setting.

Written by the indexing model from the issue text.