Fix deploy instructions: zip upload now required, not a single file

Since the static-overlay feature bundled images/static.gif, the app needs
its asset uploaded alongside the .star file. A single-file upload (the
old instructions) will fail to resolve the load("images/static.gif", ...)
path. Updated Deploy section to match ormakers-tronbyt's zip-upload
instructions; also gitignored *.zip as a build artifact.

.gitignore

@@ -1,3 +1,4 @@
 .starcache/
 *.gif
 *.webp
+*.zip

README.md

@@ -206,7 +206,13 @@ ever changes.
 
 ## Deploy
 
-Upload `subwave_nowplaying.star` directly through your Tronbyt server's
+On the Tronbyt server, go to the device's **Add App** page → **Upload app**,
-"Upload app" button on a device's Add App page (single file, no bundled
+and upload a zip of this repo's contents (`subwave_nowplaying.star` +
-assets — no need to zip). Configure the Station URL field when adding it to
+`images/`, zipped at the root, no extra parent folder) — it bundles
-your device's schedule.
+`images/static.gif` for the static-overlay effect, so a single-file upload
+of just the `.star` file will fail. Configure the Station URL field when
+adding it to your device's schedule.
+
+```
+zip -r subwave-nowplaying.zip subwave_nowplaying.star images/
+```