remove logoWidth param

[chris48s]

📋 Description

Shields exposes a param called logoWidth.
It is not very useful and doesn't really do what you would expect it to do, but it does exist.
https://img.shields.io/badge/foo-bar-blue?logo=javascript
https://img.shields.io/badge/foo-bar-blue?logo=javascript&logoWidth=50
This is really a hangover from the "popout" style which was removed in #3747
Tbh, we probably should have got rid of it then, but we didn't.

I propose we remove this param.
Passing it in the query string or an endpoint badge response should not throw an error, but it should also have no effect. We should remove it from the documentation.

The process should look similar to #10284 which removes the logoPosition param (which already did nothing).

[LitoMore]

There are some projects that use the logoWidth for adjusting the icon size, like https://github.com/xojs/xo?tab=readme-ov-file#badge.

Should we use a new parameter to allow users to customize the icon size?