[GRASS-web] [OSGeo/grass-website] 81da78: fix image URL

[Markus Neteler]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-website
  Commit: 81da7892e88fb763e3877252b7a3b00bb1710ec6
      https://github.com/OSGeo/grass-website/commit/81da7892e88fb763e3877252b7a3b00bb1710ec6
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-04-09 (Thu, 09 Apr 2020)

  Changed paths:
    M content/about/history/releases.md

  Log Message:
  -----------
  fix image URL

...omitting static/