fix(api): remove redirects from api

They should be handled either by nginx or by the client. Turned out a
lot of code, including the path migration, existed to support them.
Hence the large number of removals

tools/scripts/seed/__snapshots__/createPathMigrationMap.test.js.snap

@@ -1,17 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`createPathMigrationMap output snapshot 1`] = `
-Object {
-  "challenge-eight": "/learn/super-block-a/block-two/challenge-eight",
-  "challenge-eleven": "/learn/super-block-b/block-one/challenge-eleven",
-  "challenge-five": "/learn/super-block-a/block-two/challenge-five",
-  "challenge-four": "/learn/super-block-a/block-one/challenge-four",
-  "challenge-one": "/learn/super-block-a/block-one/challenge-one",
-  "challenge-seven": "/learn/super-block-a/block-two/challenge-seven",
-  "challenge-six": "/learn/super-block-a/block-two/challenge-six",
-  "challenge-ten": "/learn/super-block-b/block-one/challenge-ten",
-  "challenge-three": "/learn/super-block-a/block-one/challenge-three",
-  "challenge-twelve": "/learn/super-block-b/block-one/challenge-twelve",
-  "challenge-two": "/learn/super-block-a/block-one/challenge-two",
-}
-`;

tools/scripts/seed/create-path-migration.js

@@ -1,27 +0,0 @@
-const path = require('path');
-const fs = require('fs');
-require('dotenv').config({ path: path.resolve(__dirname, '../../../.env') });
-const debug = require('debug');
-
-const { getChallengesForLang } = require('../../../curriculum/getChallenges');
-const { createPathMigrationMap } = require('./createPathMigrationMap');
-
-const log = debug('fcc:tools:seedChallenges');
-const { LOCALE: lang = 'english' } = process.env;
-
-getChallengesForLang(lang).then(curriculum => {
-  log('generating path migration map');
-  const pathMap = createPathMigrationMap(curriculum);
-  const outputDir = path.resolve(
-    __dirname,
-    '../../../api-server/server/resources/pathMigration.json'
-  );
-  fs.writeFile(outputDir, JSON.stringify(pathMap), err => {
-    if (err) {
-      console.error('failed to save pathMigration');
-      console.error(err);
-    } else {
-      log('path migration map generated');
-    }
-  });
-});

tools/scripts/seed/createPathMigrationMap.js

@@ -1,25 +0,0 @@
-const { flatten } = require('lodash');
-
-const { dasherize } = require('../../../utils/slugs');
-
-function createPathMigrationMap(curriculum) {
-  return Object.keys(curriculum)
-    .map(key => curriculum[key].blocks)
-    .reduce((challenges, current) => {
-      const superChallenges = Object.keys(current).map(
-        key => current[key].challenges
-      );
-      return challenges.concat(flatten(superChallenges));
-    }, [])
-    .filter(({ isPrivate }) => !isPrivate)
-    .reduce((map, challenge) => {
-      const { title, block, superBlock } = challenge;
-      const dashedTitle = dasherize(title);
-      map[dashedTitle] = `/learn/${dasherize(superBlock)}/${dasherize(
-        block
-      )}/${dashedTitle}`;
-      return map;
-    }, {});
-}
-
-exports.createPathMigrationMap = createPathMigrationMap;

tools/scripts/seed/createPathMigrationMap.test.js

@@ -1,36 +0,0 @@
-/* global describe expect */
-const { isPlainObject } = require('lodash');
-
-const { createPathMigrationMap } = require('./createPathMigrationMap');
-const mockCurriculum = require('./__mocks__/curriculum.json');
-
-describe('createPathMigrationMap', () => {
-  const pathMap = createPathMigrationMap(mockCurriculum);
-
-  it('is a function', () => {
-    expect(typeof createPathMigrationMap).toEqual('function');
-  });
-
-  it('returns an object', () => {
-    expect(isPlainObject(pathMap)).toBe(true);
-  });
-
-  it('maps a challenge title to the correct uri slug', () => {
-    expect.assertions(3);
-    const slugOne = '/learn/super-block-b/block-one/challenge-ten';
-    const slugTwo = '/learn/super-block-a/block-two/challenge-five';
-    const slugThree = '/learn/super-block-a/block-one/challenge-three';
-
-    expect(pathMap['challenge-ten']).toEqual(slugOne);
-    expect(pathMap['challenge-five']).toEqual(slugTwo);
-    expect(pathMap['challenge-three']).toEqual(slugThree);
-  });
-
-  it('does not add uri migrations for private challenges', () => {
-    expect(pathMap['challenge-nine']).toBeUndefined();
-  });
-
-  it('output snapshot', () => {
-    expect(createPathMigrationMap(mockCurriculum)).toMatchSnapshot();
-  });
-});