Fix url issues

Author: PrinceSumberia

src/App.js

@@ -30,23 +30,31 @@ class App extends Component {
             <Switch>
               <Route
                 exact
-                path="/"
+                path={process.env.PUBLIC_URL + "/"}
                 render={() => (
                   <CovidApp
                     setDarkMode={this.setDarkMode}
                     isDarkMode={this.state.isDarkMode}
                   />
                 )}
               />
-              <Route exact path="/symptoms" render={() => <h1>symptoms</h1>} />
               <Route
                 exact
-                path="/stay-safe"
+                path={process.env.PUBLIC_URL + "/symptoms"}
+                render={() => <h1>symptoms</h1>}
+              />
+              <Route
+                exact
+                path={process.env.PUBLIC_URL + "/stay-safe"}
                 render={() => <h1>Stay Safe</h1>}
               />
-              <Route exact path="/help" render={() => <h1>Help Page</h1>} />
               <Route
-                path="/"
+                exact
+                path={process.env.PUBLIC_URL + "/help"}
+                render={() => <h1>Help Page</h1>}
+              />
+              <Route
+                path={process.env.PUBLIC_URL + "/"}
                 render={() => (
                   <CovidApp
                     setDarkMode={this.setDarkMode}