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/t410/default.nix

@@ -1,7 +1,7 @@
 { config, pkgs, ... }:
 
 {
-  imports = [ ./general-intel.nix ];
+  imports = [ ../intel.nix ];
 
   boot = {
     kernelParams = [

lenovo/thinkpad/t440p/default.nix

@@ -1,7 +1,7 @@
 { config, pkgs, ... }:
 
 {
-  imports = [ ./general-intel.nix ];
+  imports = [ ../intel.nix ];
 
   boot = {
     extraModprobeConfig = ''

lenovo/thinkpad/x140e/default.nix

@@ -1,7 +1,7 @@
 { config, lib, pkgs, ... }:
 
 {
-  imports = [ ./general.nix ];
+  imports = [ ../common.nix ];
 
   boot = {
     # wireless

lenovo/thinkpad/x220/default.nix

@@ -1,7 +1,7 @@
 { config, pkgs, ... }:
 
 {
-  imports = [ ./general-intel.nix ];
+  imports = [ ../intel.nix ];
 
   # TPM chip countains a RNG
   security.rngd.enable = true;