modules: move options to the top

This greatly improves readability and makes it easier to discover options.

This commit was genereated by running the following script inside the
repo root dir:

#!/usr/bin/env ruby

def transform(src)
  return false if src.include?('inherit options;')

  success = false

  options = nil
  src.sub!(/^  options.*?^  }.*?;/m) do |match|
    options = match
    "  inherit options;"
  end
  return false if !options

  src.sub!(/^with lib;\s*let\n+/m) do |match|
    success = true
    <<~EOF
      with lib;
      let
      #{options}

    EOF
  end

  success
end

Dir['modules/**/*.nix'].each do |f|
  src = File.read(f)
  if transform(src)
    puts "Changed file #{f}"
    File.write(f, src)
  end
end

modules/nodeinfo.nix

@@ -2,6 +2,16 @@
 
 with lib;
 let
+  options = {
+    nix-bitcoin.nodeinfo = {
+      enable = mkEnableOption "nodeinfo";
+      program = mkOption {
+        readOnly = true;
+        default = script;
+      };
+    };
+  };
+
   cfg = config.nix-bitcoin.nodeinfo;
 
   # Services included in the output
@@ -102,15 +112,7 @@ let
 
   inherit (config.services.tor.relay) onionServices;
 in {
-  options = {
-    nix-bitcoin.nodeinfo = {
-      enable = mkEnableOption "nodeinfo";
-      program = mkOption {
-        readOnly = true;
-        default = script;
-      };
-    };
-  };
+  inherit options;
 
   config = {
     environment.systemPackages = optional cfg.enable script;