treewide: modules -> profiles, separate dirs, list in README (#29)

Enforce proper naming: all paths are lowercase and hyphen-separated,
if there's a line of models (aspire, macbook-pro, thinkpad) it becomes
a subdirectory. Documentation for profiles is moved to README files in
respective directories.

Add an Org mode table that lists all available profiles and their paths.

Instead of fetching repo locally, use a Nix channel. Making hardware
profiles read-only should improve quality and amount of participation
long-term.

lenovo/thinkpad/x140e/default.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [ ../common.nix ];
+
+  boot = {
+    # wireless
+    kernelModules = [ "kvm-amd" "wl" ];
+    extraModulePackages = [ config.boot.kernelPackages.broadcom_sta ];
+
+    # audio device
+    extraModprobeConfig = ''
+      options snd_hda_intel enable=0,1
+    '';
+  };
+
+  # video card
+  services.xserver.videoDrivers = [ "ati" ];
+}