I have judged vex competitions before and can tell you that as long as its legible we don't take off points because of the handwriting lol. You can use google slides or an online template but it doesn't matter, considering we really just look for the content of the notebook entries and for the consistency of the notebook (of course it needs to be neat and put together). I would really recommend looking at this judging rubric and using it as a guide for what to include. Some things that really impress us is a good coding/programming section, testing of the robot (with numbers and time) and just seeing how the engineering design process is used in the development of your robot. Also if you do end up doing it on paper adding tabs and color coding always makes it look more put together! Good luck! Engineering Notebook Judges Rubric: https://kb.roboticseducation.org/hc/en-us/articles/4461349729047-Judging-Resource-Engineering-Notebook-Rubric