using svg for the image

projects/tetrapod/index.md

@@ -41,6 +41,6 @@ that are joined by a fifth, which binds them together:
 
 All in all we propose that these five aspects can be arranged in a tetrapodal structure
 
-<img alt="the tetrapod image for the five aspects of doing mathematics" src="tetrapod-arms.pdf"/>
+<img alt="the tetrapod image for the five aspects of doing mathematics" src="tetrapod-arms.svg"/>
 
 Feel free to include this image into your paper via the [tikz sources provided here](tetrapod-arms.tex)