Create redirects to new urls

[Twissi]

We need to add redirects to the following pages:

www.opentechschool.org/about.html -> /about www.opentechschool.org/foundation/ -> /about www.opentechschool.org/team.html -> /about www.opentechschool.org/press.html -> /about www.opentechschool.org/handbooks/.html (can also have multiple subfolders) -> /guides www.opentechschool.org/contact.html -> #get-in-touch www.opentechschool.org/sponsors.html -> /contribute#supporter www.opentechschool.org/code-of-conduct/ -> /codeOfConduct www.opentechschool.org/imprint.html -> /imprint www.opentechschool.org/dashboard.html -> / www.opentechschool.org/locator/ -> / www.opentechschool.org/projects// (no .html) -> / www.opentechschool.org/material.html -> / www.opentechschool.org/testimonials.html -> / www.opentechschool.org/berlin/ -> /cities/berlin www.opentechschool.org/leipzig/ -> /cities/leipzig www.opentechschool.org/zurich/ -> /cities/zurich www.opentechschool.org/brussels/ -> /cities/brussels www.opentechschool.org/bristol/ -> /cities/bristol www.opentechschool.org/romagna/ -> /cities/romagna all other pages either to 404 or /

Took most of the pages from: https://www.opentechschool.org/sitemap