TOML.print into buffer before writing to file

[fonsp]

You usually want to TOML.print into a buffer before writing to the file, because TOML might throw in the middle of a TOML.print, and you don't want to end up with a half-written toml file in this case.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8c26155) 33.72% compared to head (495e29f) 33.72%.

Files	Patch %	Lines
src/local_plotly_library.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   33.72%   33.72%           
=======================================
  Files          12       12           
  Lines         255      255           
=======================================
  Hits           86       86           
  Misses        169      169           

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[disberd]

Good to know, thanks!