logo: make readme logo bigger on small displays

The correct way to do this would be to use the max-width css attribute,
but codeberg seems to strip that when converting markdown to html.

The new value of 600em looks almost identical to 50% on large screens
and looks a lot better on small (mobile) screens.

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 52b57d8..93e29b5 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 <div align="center">
-  <img src="logo/logo_text_adaptive_color.svg" width="50%">
+  <img src="logo/logo_text_adaptive_color.svg" width="600em">
 </div>
 
 ## Overview