fix: add overflow css to table in blog post

www/_blog/2021-12-01-realtime-row-level-security-in-postgresql.mdx

@@ -140,10 +140,14 @@ and the resultant processing time also grows.
 
 ![supabase-realtime-processing-per-subscription](/images/blog/launch-week-three/realtime-row-level-security-in-postgresql/supabase-realtime-processing-per-subscription.png)
 
+<div class="overflow-x-scroll" markdown="block">
+
 | Subscribers         | 1    | 5    | 10   | 25   | 50   | 100  | 250  | 500  | 1,000 | 2,000 | 5,000 | 10,000 |
 |------------------------|------|------|------|------|------|------|------|------|-------|-------|-------|--------|
 | Processing Time (ms) | 11.2 | 12.5 | 14.2 | 16.7 | 18.8 | 24.5 | 27.8 | 29.1 | 64.7  | 75.5  | 158.4 | 303.8  |
 
+</div>
+
 ## Best Practices for Performance
 
 To get the most out of Realtime row level security, follow these guidelines:

www/tailwind.config.js

@@ -1,5 +1,5 @@
 module.exports = {
-  purge: ['./components/**/*.tsx', './pages/**/*.tsx'],
+  purge: ['./components/**/*.tsx', './pages/**/*.tsx', './_blog/*.mdx'],
   darkMode: 'class', // 'media' or 'class'
   mode: 'jit',
   theme: {