add discord image embedding examples to readme (#65)

Author: thebeninator

README.md

@@ -50,3 +50,20 @@ apt install -y sqlite3
 ALTER TABLE urls
 ADD COLUMN expires_at DATETIME DEFAULT NULL;
 ```
+## QR Embeds
+### tl;dr THEY DON'T WORK ON DISCORD
+
+here's the discord embed debugger that tries to scrape embed stuff from the url it is provided. 'internal error' means discord wasn't able to do this
+
+<img width="394" height="400" alt="image" src="https://github.com/user-attachments/assets/adc83ef3-7d06-458b-8cc8-3569023559a6" />
+
+here's some logs from cleezy-nginx after the embed debugger was run and a twitter post with the QR url was sent 
+```
+172.25.0.14 - - [01/Sep/2025:19:03:43 +0000] "GET /qr/EMBEDTEST1 HTTP/1.0" 404 185 "-" "Twitterbot/1.0"
+172.25.0.14 - - [01/Sep/2025:19:03:43 +0000] "GET /qr/EMBEDTEST1 HTTP/1.0" 404 185 "-" "Twitterbot/1.0"
+```
+as you can see, only twitter was able to connect to the site and scrape, display embed stuff
+
+<img width="695" height="391" alt="image" src="https://github.com/user-attachments/assets/1369dd42-09fa-4dda-9d0c-def44dbf3a0d" />
+
+ATP, the source of the issue is not very apparent