assets: fix up installation gfx (!99) · Merge requests · Teams / Websites / www.gtk.org · GitLab

Jakub Steiner requested to merge jimmac/gtk-web:wip/jimmac/docs-img-assets into gtk4-prep Nov 24, 2020

use SVG for easy editing
use the illustration style consistently, visually linking to the landing page.

Fixes https://gitlab.gnome.org/Infrastructure/gtk-web/-/issues/67