fix: remove the banner from the homepage

[illright]

Background

The banner we have on our home page is outdated and borderline cringe-worthy.

1. We rebranded a long time ago
2. The "Help" doesn't actually help, it's a strange collection of links that's only useful for automatic redirects
3. ... What do we mean "Stop the war in Ukraine"? The reader isn't the one doing it, and overwhelmingly likely has no ability to actually stop the war. Not to mention the #NoWar hashtag. There is war, and we can't just wish it away. If we can't say anything respectable about the issue, we shouldn't be saying anything.

Changelog

1. Remove the banner
2. Fix a broken link that the build step is complaining about

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