Add One-Photon Section to Ophys Tutorials

[lawrence-mbf]

Related to #532

Motivation

Add the One-Photon section as per pynwb docs

How to test the behavior?

Check HTML

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov]

Codecov Report

Merging #538 (051a3fd) into master (b63591b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #538   +/-   ##
=======================================
  Coverage   87.77%   87.77%           
=======================================
  Files         132      132           
  Lines        5621     5621           
=======================================
  Hits         4934     4934           
  Misses        687      687           

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