Increase size of landing page search box.
Increase size of landing page search box.

It really is rather small at the moment, which is both fiddly a poor UX
affordance.

Signed-off-by: Chris Lamb <29e6d179a8d73471df7861382db6dd7e64138033@debian.org>

lamby/dcs,jamessan/dcs,jamessan/dcs,lamby/dcs,jamessan/dcs,jamessan/dcs,lamby/dcs,lamby/dcs