Also not sure why just hitting yobuzzer.com with the cname is not working, but dev.yobuzzer.com works
You can't use CNAME on root domain (yobuzzer.com); you can only use CNAME on subdomain (www.yobuzzer.com, dev.yobuzzer.com, etc). Root domain should only use A or AAAA.
Though, on Cloudflare, they can flatten CNAME on root domain, technically querying A ...
Why don't you run your own?
For httpbin.org, the source code is available on GitHub and it's also available on Docker:
docker pull kennethreitz/httpbin
docker run -p 80:80 kennethreitz/httpbin
See http://httpbin.org for more information.
Also, you could achieve what you ask for i.e. "presented somehow" e.g. with a PHP one-liner:
If your primary React app located under /var/www/html/storefront directory and you can put your dashboard app under /var/www/html/storefront/dashboard directory, the most simple way to do it is to use the following configuration:
# SSL configuration by certbot here