Add robots meta

[protoroto]

Description

Add robots meta

Original pr from @corentinbettiol

References

Fixes #116

Fix #131

Checklist

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

[coveralls]

coverage: 93.798% (+0.3%) from 93.46% when pulling 6a1dada on protoroto:feature/issue-116-add-meta-robots into ef53f1f on nephila:develop.

[codecov]

Codecov Report

Patch coverage: 95.45% and project coverage change: +0.26% 🎉

Comparison is base (ef53f1f) 89.91% compared to head (6a1dada) 90.18%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #165      +/-   ##
===========================================
+ Coverage    89.91%   90.18%   +0.26%     
===========================================
  Files            9        9              
  Lines          367      387      +20     
  Branches        55       58       +3     
===========================================
+ Hits           330      349      +19     
  Misses          24       24              
- Partials        13       14       +1     

Flag	Coverage Δ
unittests	90.18% <95.45%> (+0.26%)	⬆️

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Files Changed	Coverage Δ
djangocms_page_meta/forms.py	89.28% <90.00%> (-0.19%)	⬇️
djangocms_page_meta/admin.py	95.45% <100.00%> (+0.10%)	⬆️
djangocms_page_meta/models.py	92.72% <100.00%> (+0.49%)	⬆️
djangocms_page_meta/settings.py	100.00% <100.00%> (ø)
djangocms_page_meta/utils.py	81.81% <100.00%> (+0.16%)	⬆️

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