a url having an "&" to separate parameters is converted to "&" and thereby broken

[itcarroll]

Describe the bug

When I add markdown for a link with multiple query parameters, the HTML produced replaces & with &. This results in query parameters being screwed up.

Reproduce the bug

Do a jb create book and then add the following line to book/intro.md.

Here is a [link with borked parameters](https://www.youtube.com/watch?v=lZ2FHTkyaMU&t=5s).

Preview and try the (SFW) link ... the t parameter gets stripped because the url has & rather than &.

List your environment

$ jb --version
Jupyter Book      : 1.0.2
External ToC      : 1.0.1
MyST-Parser       : 2.0.0
MyST-NB           : 1.1.1
Sphinx Book Theme : 1.1.3
Jupyter-Cache     : 1.0.0
NbClient          : 0.10.0

markdown-it-py                3.0.0
mdit-py-plugins               0.4.1

Python 3.11.9 on Ubuntu jammy.