Remove chocolatey doc

docs/chocolatey-installing.md

@@ -1,8 +0,0 @@
-Install the [Atom chocolatey package](https://chocolatey.org/packages/Atom).
-
-1. Install [chocolatey](https://chocolatey.org).
-2. Close and reopen your command prompt or PowerShell window.
-3. Run `cinst Atom`
-4. In the future run `cup Atom` to upgrade to the latest release.
-
-Note: When upgrading, Chocolatey does not delete older versions.