Remove higlight.js and marked highlighting.

Since there isn't too much of the code nowadays that should be actually
highlighted, just remove it.

package.json

@@ -67,10 +67,8 @@
     "@spacingbat3/kolor": "^4.0.0",
     "deepmerge-ts": "^7.0.3",
     "dompurify": "^3.0.1",
-    "highlight.js": "^11.4.0",
     "marked": "^15.0.4",
     "marked-gfm-heading-id": "^4.0.0",
-    "marked-highlight": "^2.0.1",
     "semver": "^7.3.5",
     "source-map-support": "^0.5.21",
     "tslib": "^2.3.1",

sources/code/renderer/preload/docs.ts

@@ -4,9 +4,7 @@ import { existsSync, readFileSync } from "node:fs";
 import { pathToFileURL, fileURLToPath } from "node:url";
 
 import { marked } from "marked";
-import { markedHighlight } from "marked-highlight";
 import { sanitize } from "dompurify";
-import hljs from "highlight.js";
 
 import { protocols } from "../../common/global";
 
@@ -19,15 +17,10 @@ import {
 
 const htmlFileUrl = document.URL;
 
-// Code highlighting and GFM heading IDs:
+// GFM heading IDs:
 
 marked.use(
   //@ts-expect-error due to TS2379
-  markedHighlight({
-    highlight: (code,language) => hljs.getLanguage(language) ?
-      hljs.highlight(code,{ language } ).value :
-      code
-  }),
   gfmHeadingId()
 );
 

tsconfig.json

@@ -15,7 +15,7 @@
         /* Whenever comments are emitted to files */
         "removeComments": true,
         /* Replace a set of core libraries. */
-        "lib": ["ES2022", "DOM.Iterable"],
+        "lib": ["ES2022", "DOM", "DOM.Iterable"],
         /* Limit module resolution to project's path only */
         "typeRoots": ["./node_modules/@types"],
         /* Use `tslib` for import helpers. */