fix: content types of extra files

[erdos]

When extra files are added to the template during evaluation (for example, with replaceImage() calls), these are not present in the [Content_Types].xml file.

Severity

Rarely causes problem if the CT XML has defaults for the extra file extension.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.86%. Comparing base (9c9a2af) to head (5e83b20).

Files with missing lines	Patch %	Lines
src/stencil/model/content_types.clj	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage   93.86%   93.86%   -0.01%     
==========================================
  Files          29       29              
  Lines        2103     2119      +16     
  Branches       92       93       +1     
==========================================
+ Hits         1974     1989      +15     
  Misses         37       37              
- Partials       92       93       +1     

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