Polish mobile and dark-mode docs styling

**Metr Tracking Issue**

**Category**: feature
**Commits**: 1
**Lines changed**: 387 (+275/-112)
**Time span**: 0 hours

**PRs**:
- #16 - Polish mobile and dark-mode docs styling

<details>
<summary>Commit details</summary>

- `1a5bf2d` Polish mobile dark-mode docs styling (#16) (+275/-112)

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