Update junior-guru logo (#1334)

We received a request to update to the new logo.

Author: dariagrudzien

src/content/pages/beginners-day-unconference.mdx

@@ -9,9 +9,10 @@ subtitle:
 As part of this year's Beginners' Day, on **Saturday 19th July** we'll be hosting the Unconference in cooperation with [junior.guru](https://junior.guru/). It's a full day of panel discussions, Q&A sessions, interactive sessions, and short talks focused on getting started and growing as a junior in a tech role.
 
 <a href="https://junior.guru" class="block w-[350px] m-auto hover:scale-105 transition-transform " target="_blank">
-![junior.guru Logo](./images/junior-guru.png)
+![junior.guru Logo](./images/junior-guru.min.svg)
 </a>
 
+
 ## Program
 
 ### Panel discussion: How to Succeed In A Junior Role