Make Category Overview Page Tiles Prettier

[RamiSouai]

PR #206 introduced overview pages for categories. Currently the description used for the tiles is the first line in the pages' md file, leading to unfitting descriptions (See Screenshot).

On top of this, the 📄️ Emoji at the start of each tile's title is cut at the bottom.

AKs:

• The tiles have a fitting description under the titles
• The emojis are no longer cut at the bottom

Additional Information:
Examining the style sheets, we see that disableing the overflow fixes the emoji issue.