Display and only include SVG

The PNG exports had a weird shade of purple and SVG display fine on the
page.

contribute/how/promote/material/logo.mdwn

@@ -27,21 +27,21 @@ PNG format
 Square
 ------
 
-[[!img tails-logo-square.png class="margin" link="no"]]
-[[!img tails-logo-square-inverted.png class="margin" link="no"]]
+[[!img tails-logo-square.svg class="margin" link="no"]]
+[[!img tails-logo-square-inverted.svg class="margin" link="no"]]
 
 Flat
 ----
 
-[[!img tails-logo-flat.png class="margin" link="no"]]
-[[!img tails-logo-flat-inverted.png class="margin" link="no"]]
+[[!img tails-logo-flat.svg class="margin" link="no"]]
+[[!img tails-logo-flat-inverted.svg class="margin" link="no"]]
 
 ### Without tagline
 
-[[!img tails-logo-flat-notagline.png class="margin" link="no"]]
-[[!img tails-logo-flat-inverted-notagline.png class="margin" link="no"]]
+[[!img tails-logo-flat-notagline.svg class="margin" link="no"]]
+[[!img tails-logo-flat-inverted-notagline.svg class="margin" link="no"]]
 
 Drawing only
 ------------
 
-[[!img tails-logo-drawing.png class="margin" link="no"]]
+[[!img tails-logo-drawing.svg class="margin" link="no"]]