Motivation / Problem

As part of #8539 Truebrain sought a representation of the company colours.

Description

Per #8539 (comment)

It was quite trivial to generate html from the Iron Horse compile as it already has in scope the company colours and a method for rgb values from palette indexes.

I've put it online at https://grf.farm/misc/company_colour_indexes.html but I don't guarantee that's stable, so we might want it in /docs for future travellers.

Limitations

• derived from the values from https://github.com/frosch123/TTDViewer/blob/master/src/recolor.xml#L186 so only as accurate as those (but frosch is generally infallible yes?)
• won't render nicely in Github, but eh, .md won't work for this case
• I didn't validate the html 🤣

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • PR must be added to API tracker