Rebrand to Pounce, the Open Source Kanban Solution

- Rename project from "kanban" to "pounce"
- Update landing page: "Pounce on your tasks"
- Replace navbar icon with cat paw
- Update seed hostname to pounce.catrenelle.com
- Write proper README with setup instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,5 +1,5 @@
 {
-	"name": "kanban",
+	"name": "pounce",
 	"private": true,
 	"version": "0.1.0",
 	"type": "module",