Prevent overflow of git hash on small screens (#826)

Previously, the "Git info" on the "About tobira" page would overflow
when the screenwidth is below ~`350px` (not a very common screen size
but the fix doesn't hurt the larger ones either).
This wraps the line instead.

frontend/src/routes/About.tsx

@@ -59,7 +59,10 @@ const About: React.FC = () => {
  <br />
  {"Git info: "}
  <a href={`https://github.com/elan-ev/tobira/commit/${version.gitCommitHash}`}>
- <code css={{ fontSize: 14 }}>{version.gitCommitHash}</code>
+ <code css={{
+ fontSize: 14,
+ overflowWrap: "anywhere",
+ }}>{version.gitCommitHash}</code>
  </a>
  {version.gitWasDirty && ", dirty"}
  <br />