Fix Teams and MCP settings pages (#6605)

# Description of Changes
Remove the Pro guards from the Team settings page and also fix the
styling of the MCP settings screen (the code sections were black text on
black background in light mode)

frontend/editor/src/core/theme/mantineTheme.ts

@@ -150,6 +150,16 @@ export const mantineTheme = createTheme({
         },
       },
     },
+
+    Code: {
+      styles: {
+        root: {
+          backgroundColor: "var(--color-gray-100)",
+          color: "var(--text-primary)",
+        },
+      },
+    },
+
     Textarea: {
       styles: (_theme: MantineTheme) => ({
         input: {