Add gallery shortcode

[jarrodmillman]

This is intended to replace:

• https://github.com/scientific-python/scientific-python.org/blob/main/layouts/shortcodes/page_gallery.html
• the following lines from https://github.com/scientific-python/scientific-python.org/blob/main/assets/css/custom.css

.gallery {
  display: flex;
  flex-wrap: wrap;
}

.gallery .entry {
  padding: 1rem;
  margin: 0.25rem;
  width: 11rem;
  text-align: center;
  vertical-align: top;
}

.gallery .photo {
  display: block;
}

.gallery .photo img {
  width: 60px;
  border-radius: 50%;
  margin-bottom: 0.5rem;
}

.gallery .name {
  font-weight: bold;
}

.gallery .project {
  display: block;
  font-size: 0.8rem;
  font-style: italic;
}

• https://github.com/scientific-python/scientific-python-hugo-theme/blob/main/assets/theme-css/teams.css

We will need to update https://github.com/scientific-python/scientific-python-hugo-theme/blob/main/tools/team_query.py

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[jarrodmillman]

The gallery should look like this:
https://pydata-sphinx-theme.readthedocs.io/en/stable/community/contributors.html#collaborators-on-the-repository

[jarrodmillman]

See #510