Update footer social links' id.

Author: Yuma Soga

app/views/application/_footer.haml

@@ -6,15 +6,15 @@
           .footer-social
             %h5 Social Links
             .footer-social-icons
-              %a.mx-1{ target: "_blank" , href: "https://twitter.com/coderdojo_konan", title: "Twitter" }
+              %a.mx-1{ target: "_new" , href: "https://twitter.com/CoderDojoKonan_", title: "Twitter" }
                 = fa_icon "twitter 2x"
-              %a.mx-1{ target: "_blank", href: "http://facebook.com/Coderdojo.Konan/", title: "Facebook" }
+              %a.mx-1{ target: "_new", href: "http://facebook.com/Coderdojo.Konan", title: "Facebook" }
                 = fa_icon "facebook 2x"
-              %a.mx-1{ target: "_blank", href: "https://www.instagram.com/coderdojo_konan/", title: "Instagram" }
+              %a.mx-1{ target: "_new", href: "https://www.instagram.com/coderdojo.konan.okayama", title: "Instagram" }
                 = fa_icon "instagram 2x"
-              %a.mx-1{ target: "_blank", href: "https://github.com/CoderDojo-Konan-Okayama", title: "Github" }
+              %a.mx-1{ target: "_new", href: "https://github.com/CoderDojo-Konan-Okayama", title: "Github" }
                 = fa_icon "github 2x"
-              %a.mx-1{ target: "_blank", href: "https://www.youtube.com/channel/UCRN6euxI9l10q6I-gVewVcw", title: "YouTube" }
+              %a.mx-1{ target: "_new", href: "https://www.youtube.com/channel/UCRN6euxI9l10q6I-gVewVcw", title: "YouTube" }
                 = fa_icon "youtube 2x"
       .row
         .col-lg-8.mx-auto.my-1.text-center.text-white