Allow overriding of author on a per page basis.

e.g. 
```toml
+++
title = "This is a PR"
extra.author = "Me"
+++
```
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Jacob Hinchliffe 2021-12-19 13:36:53 +00:00 committed by GitHub
parent 3359f859f7
commit 3cc3905552
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@ -19,7 +19,9 @@
<footer>
<hr>
<p>
{% if config.extra.author %}
{% if page.extra.author %}
Published by {{ page.extra.author }}
{% elif config.extra.author %}
Published by {{ config.extra.author }}
{% endif %}
{% if page.taxonomies.categories %}