AndrewF

Update Docker backup docs

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## Description In docs/docker-postgres-backups.rst it's suggested to use: ``` docker-compose -f local.yml exec postgres backup ``` I'd suggest updating that to: ``` docker-compose -f local.yml exec -T postgres backup ```...

open_graph.py's _create_absolute_fileurl method does not honor a SITEURL with a subdirectory

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Given `SITEURL = 'mysite.com/blog'` in the Pelican settings file. and a `fileurl` of 'posts/my_article/index.html` the `_create_absolute_fileurl` method in `open_graph.py` will return a `file_url` missing the `SITEURL`s subdirectory. This is due...