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.

dell/xps/15-9550/default.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, ... }:
+
+{
+  imports =
+    [ ../lib/kernel-version.nix
+    ];
+
+  # Use the systemd-boot efi boot loader. (From default generated configuration.nix)
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  # Honestly forget if needed or just better for touchpad.
+  # Synaptics also works, but doesn't have working palm and thumb detection.
+  services.xserver.libinput.enable = true;
+
+  # Intel Graphics confirmed not working at 4.1, confirmed working at {4.3, 4.4}
+  kernelAtleast =
+    [ { version = "4.2"; msg = "Intel Graphics confirmed not to work."; }
+      { version = "4.3"; msg = "Intel Graphics untested."; }
+      { version = "4.4"; msg = "Touchpad does not work, though the touchscreen still does"; }
+    ];
+
+  # To just use intel integrated graphics with Intel's open source driver
+  # hardware.nvidiaOptimus.disable = true;
+}