Deprecated installation instructions with mambaforge

[ageliina]

Hi,

The imSim conda installation instructions https://lsstdesc.org/imSim/install.html#install-conda instruct to install mambaforge using

curl -L -O "https://github.com/conda-forge/miniforge/releases/latest/download/Mambaforge-$(uname)-$(uname -m).sh"
bash Mambaforge-$(uname)-$(uname -m).sh

The result of the curl command is an invalid script, likely due to to the fact that mambaforge is deprecated as of July 2024 as stated here: https://github.com/conda-forge/miniforge

Replacing mambaforge with miniforge fixed this issue for my installation.

[cwwalter]

Thank you for reporting this.

We have some other documentation and CI changes we are soon making, so will incorporate this too.