[Website] Showcase Cards CSS Gradient Fixes

[moutro]

Describe your idea

There are 2 options we discussed for this task:

• Add gradient to card based on icon color

or

• Change card gradient color to purple

Sample Images of changes needed:

[moutro]

Additional context notes:

An idea was talked about to hard code this in the JSON - that we could choose the color of each icon using a color picker and then decide what the color of the background of the card should be. Every bg color will match the color of the icon we put in the JSON. So it will not be part of the CSS file, will be a style attribute using "style" prop to do it dynamically.

[noomorph]

This can be split into 2 phases:

1. use a static gradient;
2. advanced implementation: use pre-compilated gradient from the images;