Update Guildford petitions template

This is a first stab at adopting the new design.
Make link to council home page active
Update CSS overrides

Bootstrap tries to make input elements really narrow.
Put search and postcode lookup alongside one another

This is due to the carousel used elsewhere being omitted from the
petition template.
PARAM_BODY_ID isn't used any more
Some CSS tweaks to override Bootstrap's clobbering
Don't overlap the bottom border of petition type bar