Change metal colors

[Dara-K]

I added the new metal shades me and Vic chose, that is to
Winners.zip
to be used for medals and you can also see an updated color palette inside the archive.

[Dara-K]

Don't forget to read the notes on how they should be used.

[birdofpreyru]

@Dara-K
noticed that color levels in the image included into this archive disagree with what is defined in our code:

$tc-level-1: $tc-gray-50;
$tc-level-2: $tc-pastel-green;
$tc-level-3: $tc-pastel-blue;
$tc-level-4: $tc-pastel-yellow;
$tc-level-5: $tc-pastel-crimson;

The code definition looks correct to me, as we should start from a gray color.

[Dara-K]

Right. We forgot to add it in the design, please reuse same gray shade as before, those didn't change.

[birdofpreyru]

@Dara-K updated in dev (should be visible shortly at https://www.topcoder-dev.com/challenges)
There is one side-effect: now flag colors for 2-nd and places after 3-rd one are almost identical (those use $tc-gray-20, which is #a3a3ad. Also, the places after 3-rd used to have white text color, but now it looked a bit strange comparing to top places, where text became darker than the background, so I changed font color for low placement to $tc-gray-40. In result, flags for low placement look very similar to the 2-nd place one.