Remove binder buttons from tutorial gallery

[HaleySchuhl]

Describe your changes
Binder is unreliable so we want to prompt people to go to the static page docs primarily. Also, having the buttton in two places makes it easier to have an error while keeping these updated.

Type of update
Is this a:

• Bug fix
• 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 #1331 (37821dc) into release-4.0 (6d461dd) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           release-4.0     #1331   +/-   ##
=============================================
  Coverage       100.00%   100.00%           
=============================================
  Files              156       156           
  Lines             6829      6829           
=============================================
  Hits              6829      6829           

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

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[nfahlgren]

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