feat: add conversation audio for Natasha and Zanthor, update Jed Lucan convo

- Add 6 new conversation voice lines for Natasha (blackwind, maurice, nicole)
  and Zanthor (terry, balam, steve)
- Add "beth" conversation option to Jed Lucan's dialogue tree
- Remove unused game-icons asset image

public/data/opponents.json

@@ -332,7 +332,8 @@
       "voice": "Life is Strange - Jed Lucan",
       "convo": [
         "maurice",
-        "mario"
+        "mario",
+        "beth"
       ],
       "speech": {
         "intro": [
@@ -364,6 +365,11 @@
       "name": "Natasha",
       "bio": "Perhaps if I win, you will spill the secrets you've been keeping!",
       "voice": "Street Fighter 6 - Marisa",
+      "convo": [
+        "blackwind",
+        "maurice",
+        "nicole"
+      ],
       "speech": {
         "intro": [
           "natasha-intro-01",
@@ -393,6 +399,11 @@
       "spriteIndex": 12,
       "name": "Zanthor",
       "bio": "Hocus Pocus Alacazam!!!!",
+      "convo": [
+        "terry",
+        "balam",
+        "steve"
+      ],
       "speech": {
         "intro": [
           "zanthor-intro-01",