remove unused image
remove unused image

Removed src/images/gala-banner.jpg
Closes https://github.com/OperationCode/operationcode_frontend/issues/596

OperationCode/operationcode_frontend,miaket/operationcode_frontend,hollomancer/operationcode_frontend,NestorSegura/operationcode_frontend,NestorSegura/operationcode_frontend,NestorSegura/operationcode_frontend,hollomancer/operationcode_frontend,sethbergman/operationcode_frontend,OperationCode/operationcode_frontend,tal87/operationcode_frontend,tal87/operationcode_frontend,miaket/operationcode_frontend,tskuse/operationcode_frontend,hollomancer/operationcode_frontend,tal87/operationcode_frontend,tskuse/operationcode_frontend,sethbergman/operationcode_frontend,sethbergman/operationcode_frontend,miaket/operationcode_frontend,OperationCode/operationcode_frontend,tskuse/operationcode_frontend