gitignore: Add ipynb/server.url
gitignore: Add ipynb/server.url

credp/lisa,ARM-software/lisa,arnoldlu/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,mdigiorgio/lisa,bjackman/lisa,credp/lisa,bjackman/lisa,ARM-software/lisa,arnoldlu/lisa,mdigiorgio/lisa,credp/lisa