Move atom config

.atom/README.md

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-# Atom config
-
-Quick and dirty Atom config for live-coding (Tidalcycles, Hydra.js).

.config/atom/README.md

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+# Atom config
+
+Quick and dirty Atom config for live-coding (Tidalcycles, Hydra.js).
+
+## Setup
+
+Note: by default Atom uses `$HOME/.atom` as its config directory, to use
+`$HOME/.config/atom` add a global environment variable `ATOM_HOME`
+
+E.g. for arch you can add `export ATOM_HOME=$HOME/.config/atom` to the
+following file
+
+`/etc/profile.d/atom.sh`