[Inkscape-board] Linking to djangoCMS

Website update,

I've added djangoCMS to the website on request from the djangoCMS project. They've added Inkscape to their website too, you can see it here https://www.django-cms.org/en/partnerships/

Added here: https://inkscape.org/support-us/sponsors/ (infrastructure)

Background: djangoCMS is a project we've used for a long time for our inkscape website (inkscape.org) and they are undergoing reforms to make their project more sustainable. Hopefully a positive relationship will help make the website a little cheaper to maintain (especially if we can upstream some of our patches).

Best Regards, Martin Owens