get pro examples from local filesystem in development mode

[chrtze]

for a better dev experience, it would be great to be able to edit the pro examples side-by-side with the platform. this would also save some setup work as you won't need to:

• create github access token
• get upstash/redis to work
• push to the examples repo before seeing the changes

idea: when developing locally, the nhost function for downloading the example returns from local filesystem instead of remote github repo/redis.