How to hidde x axis or y axis only

I want to hidde **y axis** only, not including **y labels** or **x labels**.

How to do it?

Start by reviewing pygal's axis configuration and documentation to determine whether the y-axis line can be hidden independently of its labels and the x-axis labels. Done means documenting or supporting a way to hide only the y-axis while preserving both sets of labels; no specific file or test is named in the issue.

Written by the indexing model from the issue text.