Bump mathjax from 3.2.2 to 4.0.0

Bumps [mathjax](https://github.com/mathjax/MathJax) from 3.2.2 to 4.0.0.
- [Release notes](https://github.com/mathjax/MathJax/releases)
- [Commits](https://github.com/mathjax/MathJax/compare/3.2.2...4.0.0)

---
updated-dependencies:
- dependency-name: mathjax
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -90,7 +90,7 @@
     "icomoon-free-npm": "^0.0.0",
     "jr-qrcode": "^1.2.1",
     "material-design-icons-iconfont": "^6.7.0",
-    "mathjax": "^3.2.2",
+    "mathjax": "^4.0.0",
     "mousetrap": "^1.6.0",
     "open-dyslexic": "^1.0.3",
     "roboto-fontface": "^0.10.0",

yarn.lock

@@ -1030,6 +1030,11 @@
   resolved "https://registry.yarnpkg.com/@materializecss/materialize/-/materialize-1.2.2.tgz#3308e76806a8f6d14b7838656fbf24e0bf3496c8"
   integrity sha512-+zp/myqWFywj/F64byUM+H3iiuDmVjKBHZ0lj3b07QiaLVaNoUBCcsS0nkdwB9YsebzFpZLWeASPkmolu3yA+Q==
 
+"@mathjax/mathjax-newcm-font@^4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@mathjax/mathjax-newcm-font/-/mathjax-newcm-font-4.0.0.tgz#01afa8b20f2114665dc1d9a7fbc623a23ddb54e4"
+  integrity sha512-kpsJgIF4FpWiwIkFgOPmWwy5GXfL25spmJJNg27HQxPddmEL8Blx0jn2BuU/nlwjM/9SnYpEfDrWiAMgLPlB8Q==
+
 "@nicolo-ribaudo/eslint-scope-5-internals@5.1.1-v1":
   version "5.1.1-v1"
   resolved "https://registry.yarnpkg.com/@nicolo-ribaudo/eslint-scope-5-internals/-/eslint-scope-5-internals-5.1.1-v1.tgz#dbf733a965ca47b1973177dc0bb6c889edcfb129"
@@ -4038,10 +4043,12 @@ math-intrinsics@^1.1.0:
   resolved "https://registry.yarnpkg.com/math-intrinsics/-/math-intrinsics-1.1.0.tgz#a0dd74be81e2aa5c2f27e65ce283605ee4e2b7f9"
   integrity sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g==
 
-mathjax@^3.2.2:
-  version "3.2.2"
-  resolved "https://registry.yarnpkg.com/mathjax/-/mathjax-3.2.2.tgz#c754d7b46a679d7f3fa03543d6b8bf124ddf9f6b"
-  integrity sha512-Bt+SSVU8eBG27zChVewOicYs7Xsdt40qm4+UpHyX7k0/O9NliPc+x77k1/FEsPsjKPZGJvtRZM1vO+geW0OhGw==
+mathjax@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/mathjax/-/mathjax-4.0.0.tgz#ff7aa8b6bfdc7e97e41091a9ed6d8c8f8eefd2a0"
+  integrity sha512-ThMPHiPl9ibZBInAmfoTCNq9MgCdH7ChIQ9YhKFc325noJ4DMzy9/Q14qdcuPzVJjEmC3kyXhwnERZWX3hbWzQ==
+  dependencies:
+    "@mathjax/mathjax-newcm-font" "^4.0.0"
 
 mathml-tag-names@^2.1.3:
   version "2.1.3"