Add urls.js endpoint

[wsanchez]

Adds a resource with URLs and uses it in a bunch of places. Add imports attribute to head elements.

[codecov-io]

Codecov Report

Merging #234 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #234     +/-   ##
=========================================
+ Coverage    91.2%   91.51%   +0.3%     
=========================================
  Files          92       92             
  Lines        4027     4029      +2     
  Branches      353      353             
=========================================
+ Hits         3673     3687     +14     
+ Misses        292      280     -12     
  Partials       62       62

Impacted Files	Coverage Δ
src/ims/ext/klein.py	100% <ø> (ø)	⬆️
src/ims/config/_urls.py	100% <100%> (ø)	⬆️
src/ims/store/sqlite/test/test_store_incident.py	96.49% <100%> (ø)	⬆️
src/ims/store/sqlite/test/test_store_type.py	95.08% <100%> (ø)	⬆️
src/ims/store/sqlite/test/test_store_core.py	100% <0%> (+12.12%)	⬆️

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