Summary: Stepik adds "Dark Arts Faculty" course section

Why It Matters: This change shows Stepik is trying new ways to group courses.

What Changed:

• Removed a link to an AI generation page.
• Changed the "In Trend" course list.
• Replaced "Learn English" section with "Dark Arts Faculty (and useful skills)" section.
• Updated the number of solutions from 1,576,636,190 to 1,582,708,908.
• Updated the version number from 426.0.2931 to 427.0.2987.