feat: pageBreak function

[erdos]

Implementation for #124

[codecov]

Codecov Report

Merging #126 (69fe37f) into master (04586c1) will decrease coverage by 0.03%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   93.07%   93.04%   -0.04%     
==========================================
  Files          25       25              
  Lines        1893     1897       +4     
  Branches      107      108       +1     
==========================================
+ Hits         1762     1765       +3     
  Misses         24       24              
- Partials      107      108       +1     

Impacted Files	Coverage Δ
src/stencil/functions.clj	87.17% <66.66%> (-0.83%)	⬇️
src/stencil/ooxml.clj	100.00% <100.00%> (ø)

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