feat: replace codemirror and image viewr, opt for simplier approach

frontend/src/styles.css

@@ -366,4 +366,31 @@ pre {
         --sidebar-border: 240 3.7% 15.9%;
         --sidebar-ring: 217.2 91.2% 59.8%;
     }
+}
+
+/* Nunjucks tokens in code editor: distinct from main language (Prism) */
+.token.nunjucks-var {
+    color: #7c3aed;
+}
+.token.nunjucks-tag {
+    color: #c2410c;
+}
+.token.nunjucks-comment {
+    color: #0d9488;
+}
+.dark .token.nunjucks-var {
+    color: #a78bfa;
+}
+.dark .token.nunjucks-tag {
+    color: #fb923c;
+}
+.dark .token.nunjucks-comment {
+    color: #2dd4bf;
+}
+
+/* Prism default theme adds a background to .token.operator (e.g. "="); remove it in our code editor */
+.code-editor .token.operator,
+.code-editor .token.entity,
+.code-editor .token.url {
+    background: none;
 }