Update Dockerfile

[jtb324]

Docker(Dockerfile): - jtb324 - 9/27/25 - 2:54pm

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On branch update_docker
Changes to be committed:

    modified:   Dockerfile
    renamed:    IBDReduce/ibdreduce.py -> IBDReduce/old_versions/ibdreduce.py
    renamed:    IBDReduce/ibdreduce_v2.py -> IBDReduce/old_versions/ibdreduce_v2.py
    new file:   IBDReduce/requirements.txt
    modified:   README.md

added ibdreduce code to Dockerfile

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IBDReduce was never added to the Dockerfile, likely due to unmerged code
at somepoint that was forgotten. I added all the necessary code and
built a "venv" that automatically is activated for the user. I also
added a requirements.txt file to the IDBReduce folder so that the
environment can be recreated. The user can now run the command "python /app/ibdreduce_v3.py -h" to see the help menu.

Corresponding updated the readme to reflect this changes about how to
run ibdreduce in the docker/singularity image and how to install
dependencies if you are installing from source.

Finally moved old version of IBDreduce into a folder called
"old_version". This change helps users understand which version of the
code to use