Chore/styles

[henryiii]

Updating styles.

@klieret This is the list of failures:

_extras/discuss.md:4:FIXME
_extras/guide.md:4:FIXME
./404.md:11: Unknown or missing blockquote type caution

The 404 page is directly from styles!, and so are discuss and guide. (though maybe I need to update those?).

I assume once this works, this is a better check than travis, so we can drop travis.

[klieret]

Hi @henryiii

Sorry, late to the party. Let me quickly address the 3 errors:

• discuss.md and guide.md: These FIXMEs are there to remind the author of the lesson to add some content (can't be done in styles)
• 404: Strange, that should work. .caution is registered in the css meanwhile. Perhaps the warning disappears when everything is merged? Looks like a mismatch of versions or 404.md and the assets...

[henryiii]

Looks like Boost has been removed: actions/runner-images#2667 :(