docs(readme): Updated manualfork reference to mirror
docs(readme): Updated manualfork reference to mirror

I recently updated manualfork to a new name: mirror. Updating links and npm references.
laloptk/usho-url-shortner,Ceece/whoami,lukaskwkw/fcc-url-shortener,Ceece/timestamp-ms,tan-vu/imaging-search-layer,tan-vu/url-shortener-microservice,laloptk/usho-url-shortner,laloptk/convert-dates,megaboy101/FCC-metadata-filer,tan-vu/url-shortener-microservice,laloptk/click-count,megaboy101/FCC-metadata-filer,laloptk/image-search,tan-vu/imaging-search-layer,laloptk/click-count,lukaskwkw/fcc-url-shortener,laloptk/image-search,thebluegene/nightlife-app,roelver/shumicro,Ceece/timestamp-ms,roelver/shumicro,thebluegene/nightlife-app,laloptk/convert-dates,laloptk/request-header-parser-microservice