Allow for more user control over response removal

This MR adds more user control for the response removal step. Users can now pass a dictionary of kwargs for ObsPy's remove_response() method to the LSData init method.

There is a new private attribute on the LSData object which we check in LSForce.setup() to determine whether or not to warn users about double filtering.

Note 1: I updated example_triangle.ipynb to use custom filtering, but now the variance reduction has gone down significantly. See comparison plots in comment.

Note 2: When comparing with main for file changes, ignore all changed files in doc/ as these are just changed built documentation files.