fix: hyperlinks

[erdos]

Fixes #29.

The problem was that the resource-copier function was looking for hyperlink targets as files in the extract directory.

The fix adds extra logic for hyperlinks.

[codecov-io]

Codecov Report

Merging #30 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage   91.58%   91.62%   +0.04%     
==========================================
  Files          19       19              
  Lines        1390     1397       +7     
  Branches       84       84              
==========================================
+ Hits         1273     1280       +7     
  Misses         33       33              
  Partials       84       84

Impacted Files	Coverage Δ
src/stencil/model.clj	92.51% <100%> (+0.18%)	⬆️
src/stencil/ooxml.clj	100% <100%> (ø)	⬆️

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