63 refactor colorshadowedcard

[Kszesiek]

What happened:

• Created new widget ImageWithOverlay for the purpose of overlaying semi-opaque text over image (suggested to use with ColorShadowedCard, SwipeableCard and everywhere else where applicable)
• Used the new widget in SwipeableCard & done some cleaning there
• Used the new widget in articles page
• Major cleanup on the homescreen - exported all the remaining mockup widgets to separate files
• Refactored mockup widgets from the homescreen to use ColorShadowedCard, SwipeableCard and ImageWithOverlay so they can be further used in the current form (after creating fetching logic)
• Got rid of ColorShadowedCard2 for good
• Ironically ColorShadowedCard didn't change at all lol

How things look like atm:

[Kszesiek]

Also a lot of nitpicks. Sorry.

That's probably the PR where nitpicks are expected, if not even encouraged 😂