CRAN feedback updates

[edgararuiz]

• Updated the Title field to title case

• Changed all \notrun{} to \nottest{}

• Changed default location in llm_use() to use a temp folder

• Changed the tests to use a temp folder location

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d046e9f) to head (e77e58e).
Report is 10 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #30      +/-   ##
===========================================
+ Coverage   99.20%   100.00%   +0.79%     
===========================================
  Files          26        14      -12     
  Lines         875       531     -344     
===========================================
- Hits          868       531     -337     
+ Misses          7         0       -7     

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