Various package.json tweaks

* On `npm run dist`, build both nsis and zip
* Delete unnecessary default-app folder after pack
* Make sure installers are 32 bit
* Amend `repository` field

build/delete-default-app.js

@@ -0,0 +1,10 @@
+const fs = require('fs');
+const dir = './dist/win-ia32-unpacked/resources/default_app'
+
+exports.default = async function(context) {
+  fs.rmdir(dir, { recursive: true }, (err) => {
+    if (err) {
+        throw err;
+    }
+  });
+}