atom/docs/packages/installing.md

Installing Packages (Partially Implemented)

To install a package, clone it into the ~/.atom/packages directory. If you want to disable a package without removing it from the packages directory, insert its name into config.core.disabledPackages:

config.cson:

core:
  disabledPackages: [
    "fuzzy-finder",
    "tree-view"
  ]