docs(photon): remove broken Photon dashboard image links

The four images/photon-*.png screenshots referenced in photon-setup.md never existed in the repo, so they rendered as broken images. Remove the references; the text walkthrough stands on its own.

docs/photon-setup.md

@@ -29,8 +29,6 @@ Go to **[dashboard.photonengine.com](https://dashboard.photonengine.com/)**
 and click "Sign up". Email + password; the free tier doesn't ask for a
 card.
 
-![photon dashboard signup screen](images/photon-1-signup.png)
-
 > If you already have an account from another project, log in instead.
 > Multiple DorkNet servers can share the same Photon account, but each
 > server needs its own AppId pair so concurrent player counts don't
@@ -49,15 +47,11 @@ for:
 
 Click **CREATE**.
 
-![photon "Create a new app" form, Photon SDK selected](images/photon-2-create-realtime.png)
-
 ## Step 3 — Copy the Realtime AppId
 
 You land back on the dashboard with your new app at the top. The AppId
 is the long string under the app name — click it to copy.
 
-![photon app card with AppId highlighted](images/photon-3-realtime-appid.png)
-
 That's your **Realtime AppId**. Paste it into:
 
 - the launcher's first-run wizard step 4, **REALTIME APPID** field, OR
@@ -69,8 +63,6 @@ That's your **Realtime AppId**. Paste it into:
 If you want in-game voice chat, repeat Step 2 with **Photon Voice**
 selected instead of Realtime. Same flow.
 
-![photon "Create a new app" form, Voice selected](images/photon-4-create-voice.png)
-
 Copy the Voice AppId from the dashboard the same way as Step 3 and
 paste it into: