Burda, the German publishing group, is investing about £2 million ($4 million) in Mydeco.com, the interior-decoration-meets-social-networking website launched by Lastminute.com co-founder Brent Hoberman last year. The investment is part of a £7.35 million second-round fundraising by Mydeco.com’s parent company By Design (UK)...the valuation of the company is in the region…