Remove unused _init variables

[eclare108213]

• Short (1 sentence) summary of your PR:
  Clean up a few unused variables and update documentation
• Developer(s):
  @eclare108213
• Suggest PR reviewers from list in the column to the right.
• Please copy the PR test results link or provide a summary of testing completed below.
  All quick-suite tests pass
• How much do the PR code changes differ from the unmodified code?
  • bit for bit
  • different at roundoff level
  • more substantial
• Does this PR create or have dependencies on CICE or any other models?
  • Yes
  • No
• Does this PR add any new test cases?
  • Yes
  • No
• Is the documentation being updated? ("Documentation" includes information on the wiki or in the .rst files from doc/source/, which are used to create the online technical docs at https://readthedocs.org/projects/cice-consortium-cice/.)
  • Yes
  • No, does the documentation need to be updated at a later time?
    • Yes
    • No
• Please document the changes in detail, including why the changes are made. This will become part of the PR commit log.

Removing a few unused variables (aice_init, vice_init). Installed conda on a new laptop and discovered that the hardware platform is no longer x86_64, which slightly changes the miniconda porting instructions.

[eclare108213]

If the intent of the code boxes in the docs is to allow a user to copy everything in the box and paste it in all at once, then my change will require its own box.

[apcraig]

This all looks reasonable. Do the conda instructions work fine for ARM if you just download the correct version of miniconda? Or are there other changes needed?

[eclare108213]

Unfortunately I followed the instructions from the download site rather than those in our docs, so I'm not 100% sure, but I believe they will work the same. I did this, which amounts to almost the same thing:

curl https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-arm64.sh -o ~/miniconda3/miniconda.sh
bash ~/miniconda3/miniconda.sh -b -u -p ~/miniconda3
rm ~/miniconda3/miniconda.sh
cd icepack_ech_20250826/
conda init bash
source $HOME/miniconda3/bin/activate
conda env create -f configuration/scripts/machines/environment.yml

The flags on the bash command are different.