chore: make callback a get request

Author: DesmondSanctity

routes/index.js

@@ -156,8 +156,8 @@ const setupRoutes = (app) => {
   app.get("/api/login", login);
 
   //callbacks
-  app.post("/api/callback/github", handleOAuthCallback);
-  app.post("/api/callback/gitlab", handleOAuthCallbackGitlab);
+  app.get("/api/callback/github", handleOAuthCallback);
+  app.get("/api/callback/gitlab", handleOAuthCallbackGitlab);
 
   app.get("/api/badgedRepos", badgedRepos);
   app.post("/api/repos-to-badge", reposToBadge);