Get rid of resgen data dependencies for our public examples

[sehilyi]

We noticed that bar chart data in the Circos example is not loading.

• Data: https://resgen.io/api/v1/tiles/?d=VLFaiSVjTjW6mkbjRjWREA.0.0&s=dqf82xWWTLekrJOAzcbgRA

• Error: Failed to load resource: the server responded with a status of 500 ()

We do not have control over the resgen server, so we would need to remove any resgen dependencies in our public examples to prevent similar issues in the future.

Current resgen dependencies: https://github.com/search?q=repo%3Agosling-lang%2Fgosling.js%20resgen&type=code

(thanks to @thomcsmits for finding the issue)