Consolidate environment.prod.ts and environment.production.ts #133

We've noticed that under src/environments there are two configuration files considered in production mode:

• environment.prod.ts
• environment.production.ts

In DSpace, only environment.production.ts under src/environments exists.

These two files in the frontend should be consolidated. It appears that the settings in environment.prod.ts could potentially be moved to config.prod.yml. This would reduce confusion and potential inconsistencies between production configurations.