doc: update pr template

Removes template for individual OS links in favor of one template link
to the github actions page for the PR.

Author: jarolrod

.github/PULL_REQUEST_TEMPLATE.md

@@ -43,10 +43,9 @@ patches often sit for a long time.
 -->
 
 <!--
-Links for Windows and macOS build artifacts. Replace <PR> with the assigned pull request number.
+Link to github actions build artifacts.
+
+[![Build Artifacts](https://img.shields.io/badge/Build%20Artifacts-green
+)]()
 
-[![Windows](https://img.shields.io/badge/OS-Windows-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/win64/insecure_win_gui.zip?branch=pull/<PR>)
-[![Intel macOS](https://img.shields.io/badge/OS-Intel%20macOS-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/macos/insecure_mac_gui.zip?branch=pull/<PR>)
-[![Apple Silicon macOS](https://img.shields.io/badge/OS-Apple%20Silicon%20macOS-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/macos_arm64/insecure_mac_arm64_gui.zip?branch=pull/<PR>)
-[![ARM64 Android](https://img.shields.io/badge/OS-Android-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/android/insecure_android_apk.zip?branch=pull/<PR>)
 -->