Re-factor enquiry form schema
Correct frontpage classes and adjust styling

There ist no need to explicitly reset the padding if the default
negative margin in grid columns is kept intact - why fix something
that was not broken to start with ;)
Remove styles not applied

Since these styles are not applied in any context and therefore we
disable them again.
Remove unneccessary definitions to make rules predictable
Add a new line
Manual merge with upstream
Manual merge front page