heroku-cra-node VS nodejs-suite-demo

So I have a react website up and I want to wrap the react project within a node framework (https://github.com/mars/heroku-cra-node) so the react project would be a subdirectory of the larger project, but I already have git version control on it. Is there a clean way of stepping the version up one directory to incorporate the new code, or at least a clean way of creating a new git repository the retains the commits from the previous repository?

It seemed to me that it was trying to access those endpoints in the server (and failing, obviously, because there were no GET methods defined there) instead of rendering the index.html. So, looking at a repo describing a successful deploy of a MERN app to Heroku, I found this line and it solved this particular issue for me.

For instance, the current unstable political and economic situation in the world certainly makes investors very cautious about financing any web project. It can be a serious problem for startups, where lack or shortage of investments often turn out to be an insurmountable obstacle. This year, we’ve launched a special DHTMLX discount program to assist startup businesses deliberating over the usage of our products in their apps. This initiative allows startups to purchase top DHTMLX JavaScript UI components (Gantt, Scheduler, Suite) with 70% discounts and benefit from them at the early stages of their web or cloud-based projects. In addition to a huge discount, this program provides personalized technical support and a large base of support materials.

Being developed with the Suite JavaScrip UI widgets library, this demo app supports wide configuration and customization options. You can improve its functionality by setting drag-n-drop, inline editing, multiselection of items, exporting to Excel, and dynamiс loading, as well as attaching any other DHTMLX components or custom HTML content.

DHTMLX Suite is a comprehensive JavaScript library that enables developers to build interactive and highly performant web apps with a modern design much faster. It comes with a package of feature-rich UI widgets that can be easily customized to the needs of any web project. Recently, this library has become even more powerful thanks to the update to version 7.1.

DHTMLX JavaScript widget library has been recently updated to version 7.0. The development team has put in great efforts to make web interfaces created with Suite UI components more user-friendly and performant on various types of devices. For instance, this comprehensive release includes a new pagination widget that will make it much faster to navigate through large data sets. Now it is not an issue to implement DHTMLX UI widgets on the server-side and the Node.js demo explains how to do it with ease. The new version also ensures smooth support for touch devices.