feat(route): add new route

add /topic/:slug route both in api as well as in view

fetchers/getTopic.js

@@ -0,0 +1,59 @@
+////////////////////////////////////////////////////////
+//                     IMPORTS
+////////////////////////////////////////////////////////
+import AppError from '../utils/AppError.js';
+import fetcher from './fetcher.js';
+
+////////////////////////////////////////////////////////
+//                     FUNCTION
+////////////////////////////////////////////////////////
+const getTopic = async slug => {
+  // getting data and destructuring it in case it exists, else throwing an error
+  const res = await fetcher(`topic/${slug}`);
+  if (!Object.entries(res).length) throw new Error('no data received!');
+
+  const {
+    data: { topic: rawData },
+  } = JSON.parse(res);
+
+  if (!rawData)
+    throw new AppError("couldn't find such a topic. Maybe check the URL?", 400);
+
+  const data = {
+    tid: rawData.tid,
+    name: rawData.name,
+    url: rawData.url,
+    image: rawData.photoUrl,
+    aliases: rawData.aliases,
+    numFollowers: rawData.numFollowers,
+    numQuestions: rawData.numQuestions,
+    // isLocked: rawData.isLocked,
+    isAdult: rawData.adult,
+    mostViewedAuthors: rawData.mostViewedAuthors.map(author => ({
+      uid: author.user.uid,
+      name: `${author.user.names[0].givenName} ${author.user.names[0].familyName}`,
+      profile: author.user.profileUrl,
+      avatar: author.user.profileImageUrl,
+      isAnon: author.user.isAnon,
+      isVerified: author.user.isVerified,
+      numFollowers: author.user.followerCount,
+      numViews: author.numViews,
+      numAnswers: author.numPublicMostViewedAnswers,
+      credential: author.user.bestCredential?.translatedString,
+    })),
+    relatedTopics: rawData.relatedTopics.map(topic => ({
+      tid: topic.tid,
+      name: topic.name,
+      url: topic.url,
+      image: topic.photoUrl,
+      numFollowers: topic.numFollowers,
+    })),
+  };
+
+  return data;
+};
+
+////////////////////////////////////////////////////////
+//                     EXPORTS
+////////////////////////////////////////////////////////
+export default getTopic;