feat(redirects): Generate _redirects on build

tools/scripts/__snapshots__/createRedirects.test.js.snap

@@ -0,0 +1,45 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`createRedirects matches the snapshot 1`] = `
+"#api redirect
+
+/internal/*                                   https://api.example.com/internal/:splat
+
+# auth redirects
+/signup                                       /signin 301
+/email-signin                                 /signin 301
+/login                                        /signin 301
+/deprecated-signin                            /signin 301
+/logout                                       /signout 301
+/passwordless-change                          /confirm-email 301
+
+# certification redirects
+/:username/front-end-certification            /certification/:username/legacy-front-end 301
+/:username/data-visualization-certification   /certification/:username/legacy-data-visualization 301
+/:username/back-end-certification             /certification/:username/legacy-back-end 301
+/:username/full-stack-certification           /certification/:username/full-stack 301
+
+# unsunscribe redirects
+/u/*                                          https://api.example.com/u/:splat
+/unsunscribe/*                                https://api.example.com/unsunscribe/:splat
+/ue/*                                         https://api.example.com/ue/:splat
+
+# misc redirects
+/agile                                        / 200
+/chat                                         https://gitter.im/FreeCodeCamp/FreeCodeCamp 301
+/twitch                                       https://twitch.tv/freecodecamp 301
+/nonprofits-form                              / 200
+/pmi-acp-agile-project-managers               / 200
+/pmi-acp-agile-project-managers-form          / 200
+/stories                                      / 200
+/all-stories                                  / 200
+/field-guide/*                                https://forum.example.com 301
+/learn-to-code                                /learn 200
+/map                                          /learn 200
+/forum/*                                      https://proxy.example.com 200
+/privacy                                      https://home.example.com/forum/t/free-code-camp-privacy-policy/19545 301
+/nonprofit-project-instructions               https://home.example.com/forum/t/how-free-code-camps-nonprofits-projects-work/19547 301
+/how-nonprofit-projects-work                  https://medium.freecodecamp.org/open-source-for-good-1a0ea9f32d5a 301
+
+"
+`;