Bump remark-math from 3.0.1 to 5.1.1

Bumps [remark-math](https://github.com/remarkjs/remark-math) from 3.0.1 to 5.1.1.
- [Release notes](https://github.com/remarkjs/remark-math/releases)
- [Commits](remarkjs/remark-math@3.0.1...5.1.1)

---
updated-dependencies:
- dependency-name: remark-math
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -32,7 +32,7 @@
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "rehype-katex": "4",
-    "remark-math": "3",
+    "remark-math": "5",
     "sass": "^1.43.4",
     "url-loader": "^4.1.1"
   },