`docs/make_params.py` still uses the old package path

[hgao-astro]

docs/make_params.py still looks for the pipeline steps here:

glob("../autoprof/pipeline_steps/*.py")

but the package is under src/autoprof now, so running it from docs/ finds nothing:

$ cd docs
$ python -c 'from glob import glob; print(glob("../autoprof/pipeline_steps/*.py"))'
[]

The bad part is that the script carries on and overwrites parameters.rst, leaving basically just the page header.

It probably just needs to build the paths from __file__, look in ../src/autoprof/pipeline_steps, and stop without writing anything if the glob is empty.