Streamline pidgin setup

Use a single file instead of distributed files to setup pidgin.
Add smileys based on:
* https://unicode.org/emoji/charts/full-emoji-list.html
* https://github.com/PowaBanga/pidgin-EAP
* https://developer.pidgin.im/wiki/SmileyThemes#Creating

home.nix

@@ -7,6 +7,7 @@
     ./home/modules/programs/languagetool.nix
     ./home/modules/programs/mailhog.nix
     ./home/modules/programs/signald.nix
+    ./home/modules/programs/my-pidgin.nix
   ];
 
   home = {

home/files.nix

@@ -5,5 +5,4 @@ _:
   ".profile".source = ./files/profile;
   ".myclirc".source = ./files/myclirc;
   ".agignore".source = ./files/agignore;
-  ".purple/gtkrc-2.0".source = ./files/purple/gtkrc-2.0;
 }