This is an easy task that doesn't require coding skills (remember, contributing to
FLOSS projects is not only code development).
We need to update the logo in the banner appearing in the Welcome to Fedora repository 
and in the documentation  web pages.
What it should be done:
- file a ticket asking the design team  to update the image
- (if you are good using Inkscape or the like, submit the modified image for a review)
- once we have the updated banner, modify the Welcome to Fedora pagure start page 
forking the repository and submitting a PR
- fork the Welcome to Fedora doc page  and submit a PR here as well
If you are interested (this work could be performed in collaboration by more than one
person) please drop a note in the related Join ticket .
You will hopefully learn, among other things: how to file tickets on pagure, how to
interact with another team, maybe you will know the design guidelines, how to fork a
pagure (git) repository, how to modify a document and how to make pull requests.