Improve layout of sponsors

[Aloso]

Use a flex layout for sponsors that wraps on smaller screens and never breaks company names into multiple lines.

Desktop:

Mobile:

[Aloso]

@matklad also, the website https://ferrous-systems.com/ has some serious problems. The menu on the mobile website doesn't work, and some text has poor contrast, making it impossible to read for people with poor eyesight. Sorry for writing this here, since I couldn't find an issue tracker for the Ferrous Systems website. Maybe you could reach out to the person who maintains it?

[matklad]

the website https://ferrous-systems.com/ has some serious problems

Yeah... We are not too good with html&css ourselves :(

The menu issue is fixed, we broke our assets pipline =/

[Aloso]

@matklad to find text with poor contrast, you can use the Firefox dev tools. They have an accessibility panel for finding various problems. The Chrome dev tools have a "lighthouse" panel that reports even more problems (it's like clippy, but for websites).