Remove retired font-service links from the README

Several links in README.md no longer resolve as documented:\n\n- http://fontdeck.com/ fails DNS resolution.\n- http://www.fonts.com/web-fonts/ returns 404.\n- http://www.google.com/fonts/ returns 404.\n- The Adobe Edge Web Fonts URL is no longer reachable from the documented location.\n\nPlease update or remove retired links and replace them with current destinations where applicable. The examples for versioned CDN URLs should also be checked.\n\nReproduction: open the links from README.md at lines 3, 41, 43, 187, 280, and 292, then record the current status and replacement destination.