Remove small .png files from git lfs

.gitattributes

@@ -1,5 +1,11 @@
 * text=auto eol=lf
 Cargo.lock linguist-generated=false
 *.png filter=lfs diff=lfs merge=lfs -text
-# The icon.png is needed when including eframe via git, so it may not be in lfs
+
+# Exclude some small files from LFS:
 crates/eframe/data/* !filter !diff !merge text=auto eol=lf
+crates/egui_demo_lib/data/* !filter !diff !merge text=auto eol=lf
+crates/egui/assets/* !filter !diff !merge text=auto eol=lf
+
+# You can view the above with `git lfs track` and `git lfs status`
+# Apply the changes with `git add .gitattributes`