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.

supermicro/a1sri-2758f/default.nix

@@ -0,0 +1,20 @@
+# http://www.supermicro.com/products/motherboard/Atom/X10/A1SRi-2758F.cfm
+#
+# This board contains a TPM header, but you must supply your own module.
+#
+
+{ pkgs, lib, ... }:
+
+{
+  imports = [ ../lib/kernel-version.nix ];
+
+  environment.systemPackages = [ pkgs.ipmitool ];
+  boot.kernelModules = [ "ipmi_devintf" "ipmi_si" ];
+
+  kernelAtleast = lib.singleton
+    { version = "4.4";
+      msg =
+        "ethernet driver may be buggy on older kernels, "+
+        ''try 'networking.dhcpcd.extraConfig = "nolink";' if you encounter loss of link problems'';
+    };
+}