Add ace.js as local file

[pietzschke]

Replace the reference to cdnjs with local file for privacy reasons and no external dependencies (exception in csp must be made)

[codecov-commenter]

Codecov Report

Merging #72 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #72   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          162       162           
  Branches         7         7           
=========================================
  Hits           162       162           

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[fsbraun]

This is also an issue for djangocms-bootstrap4 and djangocms-frontend (django-cms/djangocms-frontend#48). To solve those dependencies on ace in a common way, I suggest to use PR #123 and add an optional dependency on djangocms-static-ace. If this app is loaded and installed all three djangocms apps using ace should do so locally.

[fsbraun]

Closing this since #123 just got merged. Please reopen if you feel that #123 does not solve your underlying issue! Thanks for submitting of this!