Minor typo fixes in Hackdays 2 articles

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Minor style changes to timings in Hackdays 2 article

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Adjustment to year size

Signed-off-by: Alex Coles <alex@alexbcoles.com>