I'm using Intellij Idea for a github repo I recently closed down, but It's still showing red names for classes I haven't pushed to the repo yet. Is there away I can tell the IDE not to monitor my file commits without remaking the project and copying file manually?
You can either deactivate the Git integration completely or change the colors (if the coloring is the annoying part for you).
Preferences > Plugins
Uncheck Git Integration. (Note: this will also disable the GitHub plugin)
Preferences > Editor > Colors & Fonts > File Status
After saving your current theme as a copy you can modify the colors to your liking.