RTL Version
RTL Setup using gulp
To make the default RTL version just follow the below steps.
Update the below css file links in the
                                            src/html/partials/head-css.html file. 
                                            <link href="assets/css/bootstrap-rtl.min.css" rel="stylesheet" type="text/css" />
                                            <link href="assets/css/app-rtl.min.css" rel="stylesheet" type="text/css" />
                                        
and add the below attribute in the
                                            src/html/partials/main.html file to
                                            html tag.
                                            dir="rtl" so you final html tag will be
                                             <html dir="rtl">
                                        
RTL Setup in the dist folder
To make the default RTL version just follow the below steps in the dist/default folder ( you can use any other folder too instead of the default version).
Update the below css file links in all html files. 
                                            <link href="assets/css/bootstrap-rtl.min.css" rel="stylesheet" type="text/css" />
                                            <link href="assets/css/app-rtl.min.css" rel="stylesheet" type="text/css" />
                                        
and add the below attribute in the html tag.
                                            html tag.
                                            dir="rtl" so you final html tag will be
                                             <html dir="rtl">