texlive: Use full version

Many packages that I often use are only part of texlive-full.

modules/texlive.nix

@@ -1,18 +1,7 @@
-# This module installs the medium set of texlive.
-# If more packages are needed, they should be installed locally by adding
-# something like the follwing to `shell.nix`
-#
-#     (texlive.combine { inherit (texlive) scheme-medium wrapfig; })
-#
-# TODO: include packages I often use
 { pkgs, ... }:
 
 {
   environment.systemPackages = with pkgs; [
-    (
+    texlive.combined.scheme-full
-      texlive.combine {
-        inherit (texlive) scheme-medium;
-      }
-    )
   ];
 }