Add info about MultilineBracketStyle to docs, fix issue with icons

[josh-degraw]

Closes #2743, related to #2710

[josh-degraw]

Open to discussion if there's a better way to display this, I just figured there should be some sort of callout for deprecated settings.

[nojaf]

I'm on the fence about this one. Your changes are fine and I can see value in having them.
What I'm struggling with is:

• Should we even keep the old settings documentation when the new one is working? I removed it from the online tool.
• Is documentation really going to cover it? Should we not think about printing a warning in the cli as well? The warning goes away once you have updated the .editorconfig.
• The configuration.fsx page also shows the discrepancy between the .editorconfig and FormatConfig. On a strictly technical level, v5.2 has a breaking change in Fantomas.Core 😔 As the old setting MultilineBlockBracketsOnSameColumn is no longer available there. So maybe it is better to just move forward and don't mention the old stuff anymore as a separate section. But rather as a remark in the new setting.

My availability is limited this week, but I trust you and @dawedawe will figure it out 😉.

[josh-degraw]

Yeah, I think it could make sense to just remove the old settings with just a mention of the old settings underneath the new one just to help anyone looking to ctrl+f one of the old ones. I also wouldn't be opposed to a cli warning as well. We'd probably want to do that in a separate PR, no?

[nojaf]

Skimmed true this, looks good. I'm going to let @dawedawe review it properly.

[dawedawe]

I would also prefer to have a separate PR for the CLI warning.