Strip extra levels off page url (#2695)

* Strip extra levels off page url

[CORE-708]

* Remove broken links from README

* 404 if path has extra levels

Author: RoyEJohnson

README.md

@@ -8,8 +8,6 @@
 
 [![Build Status](https://travis-ci.org/openstax/os-webview.svg?branch=master)](https://travis-ci.org/openstax/os-webview)
 [![Code Climate](https://codeclimate.com/github/openstax/os-webview/badges/gpa.svg)](https://codeclimate.com/github/openstax/os-webview)
-[![dependency Status](https://david-dm.org/openstax/os-webview.svg)](https://david-dm.org/openstax/os-webview#info=dependencies)
-[![devDependency Status](https://david-dm.org/openstax/os-webview/dev-status.svg)](https://david-dm.org/openstax/os-webview#info=devDependencies)
 
 ## Requirements
 

src/app/components/shell/router.js

@@ -146,7 +146,7 @@ function MainRoutes() {
                 <Route path="/details/" element={<Navigate to="/subjects" replace />} />
                 <Route path="/books/:title" element={<RedirectToCanonicalDetailsPage />} />
                 <Route path="/textbooks/:title" element={<RedirectToCanonicalDetailsPage />} />
-                <Route path="/subjects-preview/*" element={<ImportedPage name="subjects" />} />
+                <Route path="/subjects/*" element={<ImportedPage name="subjects" />} />
                 <Route path="/k12/*" element={<ImportedPage name="k12" />} />
                 <Route path="/blog/*" element={<ImportedPage name="blog" />} />
                 <Route path="/webinars/*" element={<ImportedPage name="webinars" />} />
@@ -158,7 +158,8 @@ function MainRoutes() {
                     path="/edtech-partner-program"
                     element={<ImportedPage name="/openstax-ally-technology-partner-program" />}
                 />
-                <Route path="/:name/*" element={<TopLevelPage />} />
+                <Route path="/:name/" element={<TopLevelPage />} />
+                <Route path="/:name/*" element={<Error404 />} />
                 <Route element={<h1>Fell through</h1>} />
             </Routes>
         </Layout>