fixup! feat: Add slots to add tab links and add slots for plugin routes

Author: xitij2000

src/index.jsx

@@ -23,7 +23,6 @@ import CoursewareRedirectLandingPage from './courseware/CoursewareRedirectLandin
 import DatesTab from './course-home/dates-tab';
 import GoalUnsubscribe from './course-home/goal-unsubscribe';
 import ProgressTab from './course-home/progress-tab/ProgressTab';
-import { CoursePageSlot } from './plugin-slots/CoursePageSlot';
 import { TabContainer } from './tab-page';
 
 import { fetchDatesTab, fetchOutlineTab, fetchProgressTab } from './course-home/data';
@@ -51,7 +50,6 @@ subscribe(APP_READY, () => {
             <UserMessagesProvider>
               <div className="app-container">
                 <Routes>
-                  <Route path="*" element={(<CoursePageSlot />)} />
                   <Route path={ROUTES.UNSUBSCRIBE} element={<PageWrap><GoalUnsubscribe /></PageWrap>} />
                   <Route path={ROUTES.REDIRECT} element={<PageWrap><CoursewareRedirectLandingPage /></PageWrap>} />
                   <Route