I've manage to create another public project, which will be useful for boot screens while your operating system is loading.
Here's the download (https://pastebin.com/NL5ULKf6) if you want.
If you want to download the file via a ComputerCraft computer, here's the command:
pastebin get NL5ULKf6 bootAnim.lua
It's at a template-like file. So if you want to make sure your code works while it's loading, remove the sleep function.