Tweak subtitle

Use a snappier subtitle given that the current subtitle is basically a
shortening of the first paragraph of the home page where the subtitle is
also shown.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

config.toml

@@ -17,7 +17,7 @@ languageCode = "en-us"
   website = "https://www.apertis.org"
 
 [Params]
-  subtitle = "Versatile open source infrastructure tailored towards automotive and other embedded applications"
+  subtitle = "The driving force in ICE systems"
   logo = "logo-white.svg"
   favicon = "favicon.ico"
   dateFormat  = "2006-01-02"