Reimplemented XML Tools and added styling (#227)

Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: #227
Reviewed-by: Mikolaj Widla <widlam@noreply.example.com>

Frontend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "new-frontend",
       "version": "0.0.0",
       "dependencies": {
+        "hljs": "^6.2.3",
         "vue": "^3.3.4",
         "vue-router": "^4.2.2"
       },
@@ -2356,6 +2357,14 @@
         "he": "bin/he"
       }
     },
+    "node_modules/hljs": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/hljs/-/hljs-6.2.3.tgz",
+      "integrity": "sha512-2vtAOX8kI7WO4/19XPFl7WJauIGsOxZkD+6LLmDWx6IQsPvxjnqqFsJlfg+wkghrb5I59OS5oeqGU7Ihbp+oOw==",
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/hosted-git-info": {
       "version": "2.8.9",
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.9.tgz",