Add a Loading Data section to the documentation page

[bparks13]

Document how to load data once it has been recorded.

Add a section on how to use the Open Ephys python tools. How to load the data, and how to plot it. Keep it simple for now.

Add a section on how to use SpikeInterface.

• Should we wait until the integration is complete to add this section? If we add a section before it is fully integrated, we will need to have some hacks in there to make it work, such as manually adding a probe group to the recording, and manually setting inter_sample_shift values so that the SpikeInterface processing methods don't throw an error.