config: Escape quotes in `Default:` section

[joshmoore]

At some point, sphinx started converting quotes to smartquotes by default. This attempts to escape them only as necessary where users will copy and paste values. It may be necessary, however, to disable them globally.

see:

• https://forum.image.sc/t/omero-web-installation-error-on-version-5-6-0/34150/3
• http://www.sphinx-doc.org/en/master/usage/configuration.html#confval-smartquotes

[mtbc]

Also see https://trello.com/c/OPOGgvps/503-in-options-renders-badly, this might help.

[joshmoore]

Cheers.