* Resolve issue with avatar storage
This resolves the issue with getting avatar storage working
updates the entrypoint to create the `pelican-data/storage` folder on start.
Adds a dev dockerfile to build locally instead of needing to update the standard dockerfile.
* Move avatar folder
Moves the avatars folder in the storage folder in-case anything else needs storage as well.
Fixes an issue in the entrypoint where it wasn't creating the sub-folder correctly.
