Add schema.org support

[protoroto]

Description

Original PR: #76

References

Fix #73

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: 98.905% (+0.6%) from 98.272% when pulling 257fd9a on protoroto:feature/76-schema.org into 65c3d5b on nephila:develop.

[codecov]

Codecov Report

Patch coverage: 81.20% and project coverage change: -4.06% ⚠️

Comparison is base (65c3d5b) 97.62% compared to head (4f3fb10) 93.57%.

❗ Current head 4f3fb10 differs from pull request most recent head 257fd9a. Consider uploading reports for the commit 257fd9a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #166      +/-   ##
===========================================
- Coverage    97.62%   93.57%   -4.06%     
===========================================
  Files            8        8              
  Lines          463      560      +97     
  Branches        79      101      +22     
===========================================
+ Hits           452      524      +72     
- Misses           8       26      +18     
- Partials         3       10       +7     

Flag	Coverage Δ
unittests	93.39% <81.20%> (-4.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
meta/models.py	82.72% <64.10%> (-11.25%)	⬇️
meta/views.py	94.71% <88.17%> (-3.43%)	⬇️
meta/settings.py	100.00% <100.00%> (ø)

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