add advanced quiz level, fix quiz key name

Author: wackerow

src/content/staking/solo/index.md

@@ -202,4 +202,4 @@ To unlock and receive your entire balance back you must also complete the proces
 - [Step by Step: How to join the Ethereum 2.0 Testnet](https://kb.beaconcha.in/guides/tutorial-eth2-multiclient) - _Butta_
 - [Eth2 Slashing Prevention Tips](https://medium.com/prysmatic-labs/eth2-slashing-prevention-tips-f6faa5025f50) - _Raul Jordan 2020_
 
-<QuizWidget quizKey="staking" />
+<QuizWidget quizKey="solo-staking" />

src/data/quizzes/index.ts

@@ -36,7 +36,7 @@ const quizzes: RawQuizzes = {
     questions: ["h001", "h002", "h003", "h004", "h005"],
   },
   "solo-staking": {
-    title: "solo-staking",
+    title: "solo",
     questions: ["j001", "j002", "j004", "j005", "j006", "j007", "j008"],
   },
 }
@@ -82,7 +82,7 @@ export const usingEthereumQuizzes: QuizzesSection[] = [
   {
     id: "layer-2",
     level: "intermediate",
-    next: "staking",
+    next: "solo-staking",
   },
   {
     id: "solo-staking",

src/types.ts

@@ -123,7 +123,7 @@ export interface RawQuizzes {
   [key: string]: RawQuiz
 }
 
-type QuizLevel = "beginner" | "intermediate"
+type QuizLevel = "beginner" | "intermediate" | "advanced"
 
 export type QuizzesSection = {
   id: string