refactor: fix relative import paths

Author: progfay

src/block/node/DecorationNode.ts

@@ -1,4 +1,4 @@
-import { convertToNodes } from ".";
+import { convertToNodes } from "./index";
 import { createNodeParser } from "./creator";
 import { createPlainNode } from "./PlainNode";
 

src/block/node/NumberListNode.ts

@@ -1,4 +1,4 @@
-import { convertToNodes } from ".";
+import { convertToNodes } from "./index";
 import { createNodeParser } from "./creator";
 import { createPlainNode } from "./PlainNode";
 

src/block/node/QuoteNode.ts

@@ -1,4 +1,4 @@
-import { convertToNodes } from ".";
+import { convertToNodes } from "./index";
 import { createNodeParser } from "./creator";
 import { createPlainNode } from "./PlainNode";
 

src/block/node/StrongNode.ts

@@ -1,4 +1,4 @@
-import { convertToNodes } from ".";
+import { convertToNodes } from "./index";
 import { createNodeParser } from "./creator";
 import { createPlainNode } from "./PlainNode";
 

src/block/node/creator.ts

@@ -1,6 +1,6 @@
-import { convertToNodes } from ".";
+import { convertToNodes } from "./index";
 
-import type { NodeParser, NodeParserOption } from ".";
+import type { NodeParser, NodeParserOption } from "./index";
 import type { Node } from "./type";
 
 export type NodeCreator<T extends Node> = (