JCF: clean up the repo by removing scripts which are no longer in use

[jcfreeman2]

I've removed the following scripts in this PR for the following reasons. When reviewing, please let me know if there are any I should un-remove:

• scripts/merge-to-master.sh: we don't use master branches anymore in our git workflow
• scripts/delete-release-tag.sh: apparently deleting rc-dunedaq-v3.0.0-5 is the last time this was used, over a year ago
• scripts/install-cvmfs-ubuntu.sh: dating from 2020, I don't think this is used anymore
• scripts/create-cvmfs-dbt.sh: last edited April 2022, this refers to a directory called /home/dingpf/cvmfs_dunedaq/tools/
• scripts/spack/get-commit-hash.sh: contains the comment This file is for generating YAML entries of DAQ packages from old release_manifest.sh, long behind us by now
• scripts/spack/spack-views.sh: dating from the early days of our Spack development, and no longer used

[jcfreeman2]

create-cvmfs-dbt.sh has been brought back in to the location requested.