docker-compose.yml: move volumes out of smr-common
docker-compose.yml: move volumes out of smr-common

The `smr-common` YAML anchor is used for both the `smr` and `smr-dev`
services. However, we were overriding the `smr-common` volumnes in
`smr-dev`. To make this less confusing, we move the volumes out of
`smr-common` and into `smr` (since that's the only service they're
used for).

smrealms/smr,smrealms/smr,smrealms/smr,hemberger/smr,hemberger/smr,hemberger/smr,hemberger/smr