absolute to relative path (#40)

Co-authored-by: Kaushik-Iyer-skima <[email protected]>

README.rst

@@ -94,10 +94,10 @@ If you want to look at conferences using pretalx, head over to the wiki for a
 `list of events`_. And if you use pretalx for your event, please add it to the
 list (or tell us about it, and we'll add it)!
 
-.. |logo| image:: https://raw.githubusercontent.com/pretalx/pretalx/main/assets/logo.svg
+.. |logo| image:: assets/logo.svg
    :alt: pretalx logo
    :target: https://pretalx.com
-.. |screenshots| image:: https://raw.githubusercontent.com/pretalx/pretalx/main/assets/screenshots.png
+.. |screenshots| image:: assets/screenshots.png
    :target: https://pretalx.com/p/features
    :alt: Screenshots of pretalx pages
 .. _issues: https://github.com/pretalx/pretalx/issues/