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/t440p/default.nix

@@ -0,0 +1,12 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [ ../intel.nix ];
+
+  boot = {
+    extraModprobeConfig = ''
+      options bbswitch use_acpi_to_detect_card_state=1
+    '';
+    kernelModules = [ "tpm-rng" ];
+  };
+}