[gimp-web/testing] 2018 report: replace mp4 with gif

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit ec32092f68cf127dcf9049c752186c9d3955f6bd
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Thu Dec 27 15:28:20 2018 +0000

    2018 report: replace mp4 with gif

 content/news/2018-12_annual_report/index.md | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/content/news/2018-12_annual_report/index.md b/content/news/2018-12_annual_report/index.md
index 1c09ee08..67e93b0a 100644
--- a/content/news/2018-12_annual_report/index.md
+++ b/content/news/2018-12_annual_report/index.md
@@ -55,11 +55,12 @@ issues in GIMP.
 sketches with color, where areas are not completely closed. It was added by
 Jehan Pagès, with contributions from Ell, and will be available in GIMP 2.10.10.
 
-<div class='video'>
-<video controls>
-<source src="smart-color-drag.mp4" type="video/mp4">
-</video>
-</div>
+<figure>
+<img src="{attach}gimp-2-10-9-smart-colorization.gif" alt="Smart colorization demo"/>
+<figcaption>
+<em>Smart colorization demo</em>
+</figcaption>
+</figure>
 
 **Performance and async jobs.** There are several attack vectors towards subpar
 performance of GIMP. Ell fixed some of the big issues by introducing async