fix: use slugs instead of title as basis for explorer (#652)

Jacky Zhao

2023-12-28 504b44716240bb3fb9a077a1acaa3dc1059e2c1e

 quartz/util/path.test.ts

@@ -83,7 +83,7 @@
  test("simplifySlug", () => {
    asserts(
      [
        ["index", ""],
        ["index", "/"],
        ["abc", "abc"],
        ["abc/index", "abc/"],
        ["abc/def", "abc/def"],