I have installed introduction package on my domain.
Question: How to delete the following text at the buttom of the packge: Running with typo3 and bootstrap package?
I'm not why you're suffering from this question while it's pretty simple. Benjamin has made things super easy to manage the stuff within EXT:bootstrap_package
Anyway, you can see the configured constant in the file constants.typoscript. In this file, you can find the copyright note, see the file here.
You can replace with your own or simply leave this empty!
That's it!