Updates matplotlib config for animations

[billbrod]

Following the investigation in #268, this updates the animation-related matplotlib configuration, adding:

plt.rcParams['animation.html'] = 'html5'
# use single-threaded ffmpeg for animation writer
plt.rcParams['animation.writer'] = 'ffmpeg'
plt.rcParams['animation.ffmpeg_args'] = ['-threads', '1']

This accomplishes several things:

• Always use single-threaded ffmpeg for the animation writer. The single-threaded is important when we have multiple users in the same binder environment. Otherwise ffmpeg tries to grab all the threads and everything freezes up.
• By setting animation.html, we automatically convert the matplotlib FuncAnimation object to the proper html5 object for display in jupyter notebooks. this removes the necessity of the convert_anim_to_html function, which we are thus able to remove.

This PR also updates some of the docstring and notebook text to reflect these changes

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
src/plenoptic/synthesize/mad_competition.py	93.03% <ø> (ø)
src/plenoptic/synthesize/metamer.py	91.78% <ø> (ø)
src/plenoptic/tools/display.py	82.19% <ø> (ø)