修复katex角标漂移等问题

package.json

@@ -6,6 +6,7 @@
   "author": "masnn",
   "license": "GPL-3.0-only",
   "dependencies": {
+    "@hydrooj/markdown-it-katex": "^2.1.0",
     "adm-zip": "^0.4.14",
     "ansi_up": "^4.0.4",
     "bson": "^4.0.2",
@@ -23,7 +24,6 @@
     "markdown-it-container": "^3.0.0",
     "markdown-it-footnote": "^3.0.2",
     "markdown-it-imsize": "^2.0.1",
-    "markdown-it-katex": "^2.0.3",
     "markdown-it-mark": "^3.0.0",
     "markdown-it-table-of-contents": "^0.4.4",
     "moment-timezone": "^0.5.31",
@@ -64,4 +64,4 @@
     ]
   },
   "snyk": true
-}
+}