Improvements to cards

[tiiavalt]

Is your feature request related to a problem? Please describe. The current cards are not navigable with keyboard and their file naming is somewhat incorrect.

Describe the solution you'd like Let's try to improve cards: their accessibility and their logic.

--

The result

• Refactored the project's structure, renamed some files and divided files
• Improved cards' accessibility and styles
• From now on the card's headers are links to series view - not the hovering rows or the card itself
• Created big css logic for rounding cards' corners