By Daniel Sheehan, Reporter Staff February 18, 2021 Daniel Sheehan, Reporter Staff Over the course of the past year, Boston’s Main Streets network provided vital support to a number of businesses in Dorchester hit hard by the Covid-19 pandemic. Beyond setting up relief funds, several Main Streets organizations pitched in to help stand-up makeshift outdoor dining areas or to facilitate take-out and delivery services. Now, the city’s Office of Economic Development has renewed an initiative to “re-imagine” Main Streets, with the goal of maintaining and expanding many of those services going forward. Natalia Urtubey, director of Small Business for the Mayor’s Office, said the health crisis revealed the importance of those services and indicated a need to build upon their existing framework.