chore(docs): replaced logo with a new one and added link to main site to it for interlinking (#6727)

Author: lexasq

apps/ngx-bootstrap-docs/src/assets/css/style.scss

@@ -346,6 +346,7 @@ header {
           top: 50%;
           left: 50%;
           transform: translate(-50%, -50%);//  TRY TO CHANGE IT
+          height: 100px;
         }
       }
     }