Code block font renders -> as → ligature Problem

### Problem

In code blocks, the arrow operator `->` is being replaced by a single `→` character. This is a font ligature that shouldn't apply to code blocks in documentation, as it misrepresents the actual C++ syntax.

### Example

See: https://develop.capy.cpp.al/capy/reference/boost/capy/strand-05.html

The member access arrow `->` displays as `→` instead of the literal two-character sequence.

### Expected behavior

Code blocks should display `->` as two distinct characters (`-` and `>`), not as a ligature.

### Likely cause

The code block font has ligatures enabled. Fix options:
1. Add `font-feature-settings: "liga" 0, "calt" 0;` to code block CSS
2. Use a font variant without ligatures
3. Set `font-variant-ligatures: none;` on code elements

### Reported by

Gennaro Prota