Update examples

[claireh93]

A few fixes to introductory examples and pluto notebooks.

[github-actions]

Pull Request Test Coverage Report for Build 6338722721

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 354 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-12.9%) to 52.92%

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Files with Coverage Reduction	New Missed Lines	%
src/Habitats.jl	9	66.52%
src/ClimatePref/DataCleaning.jl	19	0.0%
src/AbioticEnv.jl	137	30.88%
src/ClimatePref/ReadData.jl	189	0.0%

Totals
Change from base Build 6323863115:	-12.9%
Covered Lines:	1459
Relevant Lines:	2757

---

💛 - Coveralls

[github-actions]

Pull Request Test Coverage Report for Build 6338722721

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.822%

---

Totals
Change from base Build 6323863115:	0.0%
Covered Lines:	1818
Relevant Lines:	2762

---

💛 - Coveralls

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (ec6b865) 73.15% compared to head (f82dcba) 73.15%.

❗ Current head f82dcba differs from pull request most recent head 1ddaf9e. Consider uploading reports for the commit 1ddaf9e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #118   +/-   ##
=======================================
  Coverage   73.15%   73.15%           
=======================================
  Files          28       28           
  Lines        2164     2164           
=======================================
  Hits         1583     1583           
  Misses        581      581           

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