Add schema.org support

[protoroto]

Description

Original PR: #76

References

Fix #73

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
• [ ] Tests added

[coveralls]

coverage: 98.905% (+0.6%) from 98.272% when pulling 257fd9adb391d0570ac83548864baeb4cae021ac on protoroto:feature/76-schema.org into 65c3d5b4c07303e0958c74d87433c051c3904bd5 on nephila:develop.

[codecov[bot]]

Codecov Report

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

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

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/nephila/django-meta/pull/166/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nephila/django-meta/pull/166/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | `93.39% <81.20%> (-4.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/nephila/django-meta/pull/166?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [meta/models.py](https://app.codecov.io/gh/nephila/django-meta/pull/166?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-bWV0YS9tb2RlbHMucHk=) | `82.72% <64.10%> (-11.25%)` | :arrow_down: | | [meta/views.py](https://app.codecov.io/gh/nephila/django-meta/pull/166?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-bWV0YS92aWV3cy5weQ==) | `94.71% <88.17%> (-3.43%)` | :arrow_down: | | [meta/settings.py](https://app.codecov.io/gh/nephila/django-meta/pull/166?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-bWV0YS9zZXR0aW5ncy5weQ==) | `100.00% <100.00%> (ø)` | |

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