Delete diagrams/logo.webp

Removing extraneous .webp image

Description of changes:

logo.webp appears to be an image not related to POSSUM, and this PR proposes its deletion.

Description of testing:

Please make sure the following changes have been made before creating a pull request.

Update Description

[ ] Change tested on actual device
[ ] Changes tested for simulator
[ ] Existing device functionality is working fine
[ ] Unit Tests Written for Code Changes, and Verified that Coverage is 100% for Modified Files(with the exception of ATM devices)

target / POSSUM