Fix: map should redirect to current challenge (#15723)

* fix(routes): /map redirects to current challenge

* fix(map): Normalize server map building

Localize all server code dealing with the map

* refactor(server): Remove unused services

* feat(Nav): Show Map button when no panes

This gives user the ability to quickly return to their challenge using a
known feature

* fix(server.map): Add caching to nameIdMap

Add caching to nameIdMap on the server

* fix(services.map): Fix map service

Move map building utils to map util. Fix bad import. Normalize challenge
lookup

common/utils/map.js

@@ -0,0 +1,74 @@
+import emptyProtector from '../app/utils/empty-protector';
+
+export function checkMapData(
+  {
+    entities: {
+      challenge,
+      block,
+      superBlock
+    },
+    result: { superBlocks }
+  }
+) {
+  if (
+    !challenge ||
+    !block ||
+    !superBlock ||
+    !superBlocks ||
+    !superBlocks.length
+  ) {
+    throw new Error(
+      'entities not found, db may not be properly seeded'
+    );
+  }
+}
+// getFirstChallenge(
+//   map: {
+//     entities: { challenge: Object, block: Object, superBlock: Object },
+//     result: [...superBlockDashedName: String]
+//   }
+// ) => Challenge|Void
+export function getFirstChallenge({
+  entities: { superBlock, block, challenge },
+  result: { superBlocks }
+}) {
+  return challenge[
+    emptyProtector(block[
+      emptyProtector(superBlock[
+        superBlocks[0]
+      ]).blocks[0]
+    ]).challenges[0]
+  ];
+}
+
+// let challengeDashedName: String;
+// createNameIdMap({
+//  challenge: {
+//    [...challengeDashedName ]: Challenge
+// }) => {
+//   challengeIdToName: {
+//     [ ...challengeId ]: challengeDashedName
+//   }
+//  };
+export function createNameIdMap({ challenge }) {
+  return {
+    challengeIdToName: Object.keys(challenge)
+      .reduce((map, challengeName) => {
+        map[challenge[challengeName].id] =
+          challenge[challengeName].dashedName;
+        return map;
+      }, {})
+  };
+}
+// addNameIdMap(
+//  map: { entities; Object, ...rest }
+// ) => { ...rest, entities: Object };
+export function addNameIdMap({ entities, ...rest }) {
+  return {
+    ...rest,
+    entities: {
+      ...entities,
+      ...createNameIdMap(entities)
+    }
+  };
+}