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.

airis/n990/default.nix

@@ -0,0 +1,22 @@
+{ ... }:
+
+{
+  boot = {
+    initrd.kernelModules = [ "pata_via" ];
+
+    kernelParams = [
+      "apm=on"
+      "acpi=on"
+      "vga=0x317"  # 1024x768
+      "console=tty1"
+      "video=vesafb:ywrap"  # Faster scroll
+     ];
+  };
+
+  services.xserver = {
+    videoDriver = "unichrome";
+    synaptics.enable = true;
+  };
+
+  networking.enableIntel2200BGFirmware = true;
+}