smf gallery wall

[maliagehan]

updated gallery wall

Describe your changes
added smf tutorial to gallery wall

Type of update
Is this a:

• New feature or feature enhancement
• Update to documentation

Associated issues
Reference associated issue numbers. Does this pull request close any issues?

Additional context
Add any other context about the problem here.

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[codecov]

Codecov Report

Merging #1329 (34ff57d) into release-4.0 (0e4464d) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           release-4.0     #1329   +/-   ##
=============================================
  Coverage       100.00%   100.00%           
=============================================
  Files              156       156           
  Lines             6772      6772           
=============================================
  Hits              6772      6772           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[HaleySchuhl]

Tried to test it out but got an error while launching binder? Error downloading object: img/test-cropped_6dpimock.raw (020c1ee): Smudge error: Error downloading img/test-cropped_6dpimock.raw.