Add links to Driving and transport subsection
Add links to Driving and transport subsection

This adds two links to "the Driving and transport" subsection of the
"Check how coronavirus is affecting public services" section:
- [Driving tests and MOTs for heavy vehicles suspended](https://www.gov.uk/government/news/driving-tests-and-mots-for-heavy-vehicles-suspended-for-up-to-3-months-to-help-tackle-spread-of-coronavirus)
- [Relaxation of drivers’ hours rules](https://www.gov.uk/government/publications/covid-19-guidance-on-drivers-hours-relaxations/coronavirus-covid-19-guidance-on-drivers-hours-relaxations)

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