remove codemirror dep and restructure a bit

src-web/components/responseViewers/PdfViewer.tsx

@@ -7,6 +7,13 @@ import React, { useRef, useState } from 'react';
 import { Document, Page } from 'react-pdf';
 import { useContainerSize } from '../../hooks/useContainerQuery';
 
+import('react-pdf').then(({ pdfjs }) => {
+  pdfjs.GlobalWorkerOptions.workerSrc = new URL(
+    'pdfjs-dist/build/pdf.worker.min.mjs',
+    import.meta.url,
+  ).toString();
+});
+
 interface Props {
   bodyPath: string;
 }