Add proper button navigation

Assets/Resources/PlayerArmor.asset

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+    Description: If you drink the milk, your mooscles will be stronk, and you can
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+    Name: Champion's Tunic
+    Description: This blue tunic seems to have belonged to a fallen hero hundreds
+      of years ago.
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+    Name: Tunic of Time
+    Description: This green tunic may look familiar.
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+    Name: Hero's Boots
+    Description: These boots may look familiar.
+    Bonus: 2
+  Amount: 2

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Assets/Resources/PlayerInventory.asset

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Assets/Resources/PlayerStarterWeapon.asset

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+  - Sprite: {fileID: -4063295180217184869, guid: b00993d063fbc4a87983115070f6145c,
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+    Name: Basic Sword
+    Description: A basic common sword, which is not particularly useful in battle,
+      but keeps you safe from wildlife.
+    Bonus: 2
+  - Sprite: {fileID: -7651958066320933242, guid: b00993d063fbc4a87983115070f6145c,
+      type: 3}
+    Name: Weird Sword
+    Description: This sword is kind of weird. But it seems to do the job!
+    Bonus: 1
+  - Sprite: {fileID: 206911327383899660, guid: b00993d063fbc4a87983115070f6145c, type: 3}
+    Name: Dagger
+    Description: Small dagger, easy to use and deadly, but with little range.
+    Bonus: 1
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+      type: 3}
+    Name: Wood Axe
+    Description: This axe was built to chop down trees. Apparently it also chops
+      down your enemies!
+    Bonus: 3
+  Amount: 1

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Assets/Scripts/Shop/Components/ShopNavButton.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class ShopNavButton : MonoBehaviour
+{
+    private Image[] highlights;
+
+    private void Start()
+    {
+        var buttons = GetComponentsInChildren<Button>(true);
+        List<Image> allHighlights = new List<Image>();
+        foreach (var button in buttons)
+        {
+            for(int i = 0; i < button.transform.childCount; i++)
+            {
+                var img = button.transform.GetChild(i).GetComponent<Image>();
+                if(img != null)
+                    allHighlights.Add(img);
+            }
+        }
+        highlights = allHighlights.ToArray();
+    }
+
+    public void SetActiveButton(Button active)
+    {
+        foreach (var highlight in highlights)
+        {
+            highlight.gameObject.SetActive(highlight.transform.parent == active.transform);
+        }
+    }
+}

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