ci: update release discord notification

- Update icons to use the Light background version (while pre-relases will use the Dark backaground)
- Add pip installation instructions

Author: LittleCoinCoin

.github/workflows/release-discord-notification.yml

@@ -21,9 +21,14 @@ jobs:
             
             🚀 Get the latest features and improvements
             📚 Click [here](${{ github.event.release.html_url }}) to view the changelog and download
+
+            💻 Install with pip:
+            ```bash
+            pip install hatch-xclam
+            ```
             
             Happy MCP coding with *Hatch!* 🐣
           color: 0x00ff88
           username: "Cracking Shells Release Bot"
-          image: "https://raw.githubusercontent.com/CrackingShells/.github/main/resources/images/hatch_icon_dark_bg_transparent.png"
-          avatar_url: "https://raw.githubusercontent.com/CrackingShells/.github/main/resources/images/cs_core_dark_bg.png"
+          image: "https://raw.githubusercontent.com/CrackingShells/.github/main/resources/images/hatch_icon_light_bg_transparent.png"
+          avatar_url: "https://raw.githubusercontent.com/CrackingShells/.github/main/resources/images/cs_icon_light_bg.png"