fix(path): handle lone slash (#1713)

quartz/util/path.test.ts

@@ -171,6 +171,10 @@ describe("transforms", () => {
     assert.strictEqual(path.joinSegments("/a", "b/"), "/a/b/")
     assert.strictEqual(path.joinSegments("/a/", "b/"), "/a/b/")
 
+    // lone slash
+    assert.strictEqual(path.joinSegments("/a/", "b", "/"), "/a/b/")
+    assert.strictEqual(path.joinSegments("a/", "b" + "/"), "a/b/")
+
     // works with protocol specifiers
     assert.strictEqual(path.joinSegments("https://example.com", "a"), "https://example.com/a")
     assert.strictEqual(path.joinSegments("https://example.com/", "a"), "https://example.com/a")

quartz/util/path.ts

@@ -188,7 +188,7 @@ export function joinSegments(...args: string[]): string {
   }
 
   let joined = args
-    .filter((segment) => segment !== "")
+    .filter((segment) => segment !== "" && segment !== "/")
     .map((segment) => stripSlashes(segment))
     .join("/")