Delete unnecessary ai.navigate package (#181)

Author: RyodoTanaka

Packages/manifest.json

@@ -1,6 +1,5 @@
 {
   "dependencies": {
-    "com.unity.ai.navigation": "1.1.5",
     "com.unity.burst": "1.8.18",
     "com.unity.collab-proxy": "2.5.1",
     "com.unity.ide.rider": "3.0.31",

Packages/packages-lock.json

@@ -1,14 +1,5 @@
 {
   "dependencies": {
-    "com.unity.ai.navigation": {
-      "version": "1.1.5",
-      "depth": 0,
-      "source": "registry",
-      "dependencies": {
-        "com.unity.modules.ai": "1.0.0"
-      },
-      "url": "https://packages.unity.com"
-    },
     "com.unity.burst": {
       "version": "1.8.18",
       "depth": 0,