Replace --tech with --breaks-style in make-maps CLI

[mjgleason]

Why this feature is necessary:
Currently, the make-maps command allows the user to select from two technologies (wind and solar), which results in the use of hard-coded legend breaks for the various maps.

@ppinchuk raised the point that this is limiting for other technologies (e.g., geothermal) and, even for wind and solar, the hard-coded legend breaks may not always be suitable for every supply curve.

A possible solution is:
As discussed in PR 38, a possible solution would be to replace the existing --tech option with a --breaks-style option. The user could then choose from a set of options including wind and solar (which would use the existing hard-coded breaks for those technologies) or auto, which would use an automatic classification (e.g., Jenks-Fisher with 5 breaks).

I have considered the following alternatives:
An alternative solution would be to implement the new --breaks-style and enable the user to select any classification from https://pysal.org/mapclassify/api.html#classifiers. The user would have to specify the classifier name (and if applicable, a number of breaks), e.g., --breaks-style fisherjenks:5.

Additional context
NA

Charge code
NA. This is a nice to have at the moment.

Urgency / Timeframe
Not urgent at all.

[mjgleason]

Closed by #47