chore(snap): add icon, and fix other properties

snapcraft.yaml

@@ -6,6 +6,11 @@ description: |
   A cross platform mDNS-Browser app written in Rust using tauri and leptos
 grade: stable
 confinement: strict
+icon: src-tauri/icons/icon.png
+issues: https://github.com/hrzlgnm/mdns-browser/issues
+license: MIT License
+source-code: https://github.com/hrzlgnm/mdns-browser
+
 platforms:
   amd64:
     build-on: [amd64]
@@ -37,5 +42,6 @@ parts:
       - libayatana-appindicator3-1
     source: https://github.com/hrzlgnm/mdns-browser/releases/download/mdns-browser-v0.9.0/mdns-browser_0.9.0_amd64.deb
     source-type: deb
-    override-build: snapcraftctl build
+    override-build: |
+      snapcraftctl build
       sed -i -e "s|Icon=mdns-browser|Icon=/usr/share/icons/hicolor/32x32/apps/mdns-browser.png|g" $SNAPCRAFT_PART_INSTALL/usr/share/applications/mdns-browser.desktop