[GRASS-git] [OSGeo/grass-website] 059061: Fix books images width

[Nicolas Bozon]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-website
  Commit: 059061a5c3ef9f762faf514da6f4f425e811954b
      https://github.com/OSGeo/grass-website/commit/059061a5c3ef9f762faf514da6f4f425e811954b
  Author: nbozon <nicolas.bozon at cartogenic.com>
  Date:   2020-09-13 (Sun, 13 Sep 2020)

  Changed paths:
    M content/learn/books.md
    M themes/grass/assets/css/style.css
    M themes/grass/layouts/learn/books.html
    M themes/grass/layouts/partials/head.html

  Log Message:
  -----------
  Fix books images width

Fix books images min & max width, also on small screens