feat(homepage): Reverting certain changes

[Gandalf-the-Blue]

🔧 What does this fix? 🔧

Fixes certain issues from PR #915. Base background colour revert to slightly lighter colour(base), in accordance with catppuccin userstyle guide. Base box colour revert to slightly darker colour (mantle), in accordance with catppuccin userstyle guide. Reverted hover colours to accent colour, else accent colour is completely absent from the styling.

Invite @BPplays (original PR author) for any comments.

🗒 Checklist 🗒

• [x] I have read and followed Catppuccin's contributing guidelines.
• [x] I have updated the version appropriately in the ==UserStyle== header of the catppuccin.user.css file.