[Documentation]: Remove Brain Observatory example

[rly]

What would you like changed or added to the documentation and why?

The Allen Brain Observatory gallery tutorial uses the allensdk API to download an NWB file into a cache folder and then creates a new NWB file with the same data step by step. Everything that is demonstrated here is demonstrated in other tutorials, aside from the allensdk API, which is well documented in the allensdk docs.

This example also causes a minor headache with the test harness because it involves installing allensdk which is not well maintained with new versions of python, and it downloads a 450 MB file, which takes some time.

Ref: #1538 (comment)

I propose we remove the example and it looks like @bendichter and @stephprince approve of that. I'll make a quick PR.

Do you have any interest in helping write or edit the documentation?

Yes.

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