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.

launcher/Backend/SteamlessInstaller.cs

@@ -22,12 +22,9 @@ namespace DorkNet.Launcher.Backend;
 public static class SteamlessInstaller
 {
     private const string PinnedVersion = "v3.1.0.5";
-    // Upstream names the asset "Steamless.{ver}.-.by.atom0s.zip" — NOT
-    // "Steamless.{ver}.zip". Getting this wrong is a 404 at the
-    // "Unlock Rec Room from Steam" step.
     private const string ZipUrl =
         "https://github.com/atom0s/Steamless/releases/download/" +
-        PinnedVersion + "/Steamless." + PinnedVersion + ".-.by.atom0s.zip";
+        PinnedVersion + "/Steamless." + PinnedVersion + ".zip";
 
     private static readonly HttpClient Http = new()
     {