fix: icon images converted from .bmp into .png

Lorenz Lehmann

04.12.23 82145355fe9329edfffad6f9d6b12f8088a3c612

 .gitignore

@@ -1,11 +1,10 @@
# MacOS Finder files
.DS_Store

# LispWorks files
*.*fasl
*.*~
*.lisp~
*.lisp#
*.*~
*.*#

# OM Reference files
/reference-pages/