fix: correct the swagger ui link to support --rootpath (argoproj#14845)

Signed-off-by: Kevin Yue <yuezk001@gmail.com>
Signed-off-by: Jimmy Neville <jimmyeneville@gmail.com>

Author: yuezk

ui/src/app/help/components/help.tsx

@@ -66,7 +66,7 @@ export const Help = () => {
                                     <div className='columns large-4 small-6'>
                                         <div className='help-box'>
                                             <p>You want to develop against Argo CD's API?</p>
-                                            <a className='user-info-panel-buttons argo-button argo-button--base' href='/swagger-ui'>
+                                            <a className='user-info-panel-buttons argo-button argo-button--base' href='swagger-ui'>
                                                 Open the API docs
                                             </a>
                                         </div>