do not merge entities into XML page import

Codecov Report

Merging #611 into master will decrease coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #611      +/-   ##
==========================================
- Coverage   85.25%   85.24%   -0.01%     
==========================================
  Files         222      222              
  Lines       13372    13364       -8     
==========================================
- Hits        11400    11392       -8     
  Misses       1972     1972

Impacted Files	Coverage Δ
arkindex/documents/pagexml.py	95.98% <100%> (-0.14%)
arkindex/documents/tests/test_pagexml.py	100% <100%> (ø)

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merged

mentioned in commit 2a11e5db