- Fullcolor tour
- Basic CSS keyframe animations
- Use of default grey backgrounds due to headerbar

Fixes https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/29

Tour is not an app because it has NoDisplay=true in its desktop file.
Therefore, it should not install appstream metainfo. This could be
brought back in the future if the desktop file is made visible.

See discussion in:

https://gitlab.gnome.org/GNOME/gnome-software/-/issues/445

https://gitlab.gnome.org/GNOME/gnome-software/-/issues/445

marks the app as essential for GNOME
fixes #20

closes #19

600x300px

you should be able to configure the video path at build
time by passing --video_path=absolute_path
which will be played instead of displaying the LOGO

It doesn't need to be exposed since its a system app, like initial-setup. 

- get rid of the purple. The joys of a colorblind designer

addresses concern https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/17#note_886067

- align Software icon
- adjust grid position and alignment
- replace some app icons

See https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/17

- Add dropshadow for the Software icon, replace Banner viewer with
  Foliate

Based on design review https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/17

Created in collaboration with Sam Hewitt.

Fixes https://gitlab.gnome.org/GNOME/gnome-tour/issues/6

Provide a fun engaging closure to the guide.

Things left to do:

- adjust wording
- set background class to .last-page for the style to work

Fixes https://gitlab.gnome.org/GNOME/gnome-tour/issues/7

- scaled up all assets for them to render sharp
- unified the sizing so they don't jump around
- unified stroke sizes
- optimized with SVGO

original assets to create derivatives are at
https://gitlab.gnome.org/Teams/Design/os-mockups/tree/master/greeter/assets