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