Update branding

[benbarth]

• I've read the Contributing.md file
• I do not intend to make low-value changes, just for swag. I am aware that my PR could otherwise be flagged as spam or invalid and may lead to permanent exclusion from the Hacktoberfest event.

Adding a new Hacktoberfest participant

• I did not edit the README.md file by hand
• I made sure, that the new participant has not already been added
• I'm not adding a company from the blocklist

Editing an existing Hacktoberfest participant

• I did not edit the README.md file by hand
• I made proper changes to the existing participant.yml file

[benbarth]

I'm using the new 2021 branding SVG. It might be a little large when rendered. Let's see how it looks.

[SoftCreatR]

The font used should be the same every year, that's why I've created a generic version of it, so that there wouldn't be any need to replace it. You can do it, if you like, but imho I would keep it as is.

[SoftCreatR]

I've created an updated version of the logo file we use here. While it might be easier to just use the original logo, I still prefer a customized one :)

Official version:

My version (including the subtitle from our last customized logo for 2020):

I'm not 100% confident if my version violates HFs branding guidelines, but if it does, they might get in touch with us.