Source image for talk previews needs an update for 2021

[drewbrew]

Expected behavior:
The talk preview images should have a DCUS 2021 online background

Actual behavior:
They have a 2020 San Diego background

Steps to repeat behavior:
Look at any of the images in 8182ea3

This particular file is the one that needs updating: https://github.com/djangocon/2021.djangocon.us/blob/develop/static/img/speaker-template-bg.svg

[jefftriplett]

It looks like we can edit this with https://boxy-svg.com/app but it's not quite as simple as grabbing the text and re-typing it for me. Maybe we can delete the 2020 and re-type/adjust it.

[shariq1989]

Do we have the font and color information? If the font is available on boxy, I can just update the year for now and the image as time permits.

[jefftriplett]

I'm honestly not sure. This was all intended for 2020, but then we stopped and resumed again this year. There might be some clues in our 2020 resources: https://github.com/djangocon/resources/tree/master/us-2020

[jefftriplett]

I think this is fixed in #110 but I'm not against more polish.