fix: add missing icon field to FAQ and index pages; update meta.json structure

Author: NonSwag

content/docs/worlds/faq.mdx

@@ -1,5 +1,6 @@
 ---
 title: Frequently Asked Questions
+icon: MessageCircleQuestion
 ---
 
 import { Accordion, Accordions } from "fumadocs-ui/components/accordion"

content/docs/worlds/index.mdx

@@ -1,6 +1,7 @@
 ---
 title: Overview
 description: World management plugin for modern Paper and Folia servers
+icon: BookMarked
 ---
 
 import { Group, Blend, Link2, MessageCircleQuestion } from "lucide-react"

content/docs/worlds/meta.json

@@ -6,12 +6,13 @@
     "[Send][Hangar](https://hangar.papermc.io/TheNextLvl/Worlds)",
     "[ChartLine][Metrics](https://bstats.org/plugin/bukkit/TheNextLvl%20Worlds/19652)",
     "[BookDown][Repository](https://repo.thenextlvl.net/#/releases/net/thenextlvl/worlds)",
-    "---Guide---",
+    "---Introduction---",
     "index",
+    "faq",
+    "---Guide---",
     "manage",
     "presets",
     "links",
-    "faq",
     "---For Developers---",
     "api/repository",
     "api/index"