Revert "[#63734] support mermaid diagrams"

This reverts commit e9f23c6.

package.json

@@ -15,7 +15,6 @@
     "test": "PW_TEST_HTML_REPORT_OPEN=never playwright test -c tests/playwright.config.js --reporter html"
   },
   "dependencies": {
-    "@agoose77/markdown-it-mermaid": "^1.1.0",
     "@codemirror/commands": "^6.2.4",
     "@codemirror/lang-markdown": "^6.2.3",
     "@codemirror/merge": "@6.0.0",

src/hooks/useText.js

@@ -4,7 +4,6 @@ import markdownIt from "markdown-it";
 import { markdownReplacer, useCustomRoles } from "./markdownReplacer";
 import { useCallback, useEffect, useMemo, useReducer, useState } from "preact/hooks";
 import IMurMurHash from "imurmurhash";
-import markdownItMermaid from "@agoose77/markdown-it-mermaid";
 
 const countOccurences = (str, pattern) => (str?.match(pattern) || []).length;
 
@@ -63,12 +62,7 @@ export const useText = ({ initialText, transforms, customRoles, preview }) => {
   }, []);
 
   const markdown = useMemo(
-    () =>
-      markdownIt({ breaks: true, linkify: true })
-        .use(markdownitDocutils)
-        .use(markdownReplacer(transforms))
-        .use(useCustomRoles(customRoles))
-        .use(markdownItMermaid),
+    () => markdownIt({ breaks: true, linkify: true }).use(markdownitDocutils).use(markdownReplacer(transforms)).use(useCustomRoles(customRoles)),
     [],
   );