github: Use Markdown and slight changes to PR template

The previous pull request was kinda not exactly tested.
This one should be better and more visible.

Fixes: 9a273c3e79 ("github: Improve Pull Request template")

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

.github/pull_request_template

@@ -1,19 +0,0 @@
-**Package details**
-
-    Maintainer: @\<github-user> (find it by checking the history of the package Makefile)
-    Description:
-
-**Indication of run testing**
-
-     OpenWrt version:
-     OpenWrt target/subtarget:
-     OpenWrt device:
-
-**Formalities**
-
-     [ ] Review the [CONTRIBUTING.md](../CONTRIBUTING.md) file for detailed contributing guidelines.
-
-     If your PR contains a patch
-     [ ] Make sure that it can be applied by `git am`
-     [ ] It must be refreshed to avoid offsets, fuzzes, etc by `make package/foo/refresh V=s`
-     [ ] It must be in a way that it is potentially upstreamable (subject, commit description, etc.), and we must try to upstream it so we have fewer patches and fewer.

.github/pull_request_template.md

@@ -0,0 +1,32 @@
+## 📦 Package Details
+
+**Maintainer:** @<github-user>
+<sub>(You can find this by checking the history of the package `Makefile`.)</sub>
+
+**Description:**
+<!-- Briefly describe what this package does or what changes are introduced -->
+
+---
+
+## 🧪 Run Testing Details
+
+- **OpenWrt Version:**
+- **OpenWrt Target/Subtarget:**
+- **OpenWrt Device:**
+
+---
+
+## ✅ Formalities
+
+- [ ] I have reviewed the [CONTRIBUTING.md](../CONTRIBUTING.md) file for detailed contributing guidelines.
+
+### If your PR contains a patch:
+
+- [ ] It can be applied using `git am`
+- [ ] It has been refreshed to avoid offsets, fuzzes, etc., using
+  ```bash
+  make package/<your-package>/refresh V=s
+  ```
+- [ ] It is structured in a way that it is potentially upstreamable
+<sub>(e.g., subject line, commit description, etc.)</sub>
+<sub>We must try to upstream patches to reduce maintenance burden.</sub>