Is there any way to completely delete the two lines "Congratulations! you have successfully installed..." and "Welcome Guest! Would you like to log yourself in"?

I read here how to change the text; but I want to remove those two lines completely.

I tried just deleting the text from the includes/languages/ENGLISH/index.php file and not replacing it with anything, but then I get a line that says 'HEADING_TITLE' in its place.

I guess I need to remove the call for those two lines entirely?

For the type of store I'm building, I don't need either of those two lines of text. Anybody know how to accomplish what I'm trying to do?

Thanks in advance!