Improve django-app-enabler support

[yakky]

Description

• Add django-app-enabler documentation
• Improve addon config

References

Fix #660

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [x] Usage documentation added in case of new features
• [x] Tests added

[codecov[bot]]

Codecov Report

Merging #661 (d84f0e7) into develop (3c42a1e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #661   +/-   ##
========================================
  Coverage    94.51%   94.51%           
========================================
  Files           21       21           
  Lines         1112     1112           
  Branches       138      138           
========================================
  Hits          1051     1051           
  Misses          23       23           
  Partials        38       38           

Flag	Coverage Δ
unittests	94.51% <ø> (ø)

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[coveralls]

Coverage remained the same at 96.958% when pulling d84f0e7c888ab4fb13436fc0577dc6c742ecc6da on feature/issue-660-improve-app-enabler into 3c42a1edd3d538b3f810b6557bf2dc2376f291f1 on develop.