First implementation of dark mode

frontend/package-lock.json

@@ -12,6 +12,7 @@
         "@codemirror/commands": "^6.6.2",
         "@codemirror/lang-markdown": "^6.2.5",
         "@codemirror/state": "^6.4.1",
+        "@codemirror/theme-one-dark": "^6.1.2",
         "@codemirror/view": "^6.34.0",
         "@geist-ui/core": "^2.3.8",
         "@geist-ui/icons": "^1.0.2",
@@ -2096,6 +2097,18 @@
       "integrity": "sha512-QkEyUiLhsJoZkbumGZlswmAhA7CBU02Wrz7zvH4SrcifbsqwlXShVXg65f3v/ts57W3dqyamEriMhij1Z3Zz4A==",
       "license": "MIT"
     },
+    "node_modules/@codemirror/theme-one-dark": {
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/@codemirror/theme-one-dark/-/theme-one-dark-6.1.2.tgz",
+      "integrity": "sha512-F+sH0X16j/qFLMAfbciKTxVOwkdAS336b7AXTKOZhy8BR3eH/RelsnLgLFINrpST63mmN2OuwUt0W2ndUgYwUA==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "@lezer/highlight": "^1.0.0"
+      }
+    },
     "node_modules/@codemirror/view": {
       "version": "6.34.0",
       "resolved": "https://registry.npmjs.org/@codemirror/view/-/view-6.34.0.tgz",