cmd/server: Export useful bootstrap function

[someone1]

I had discussed this in issue #949 and removed it from my PR #956 suggesting we add it to #948 instead. I see that NewHandler was exported but this doesn't boostrap the hydra features into the handler.

I think exporting registerRoutes is necessary to make this useful. I'd also suggest we consider exporting rejectInsecureRequests and possibly even enhanceRouter as they also perform helpful bootstrap options but are not necessary.

I can submit a PR to export these functions if you find it agreeable!

EDIT:
Exporting enhanceRouter would remove the need to export registerRoutes as it has access and uses it.

[aeneasr]

Exporting them sounds OK to me!

[aeneasr]

Oh and could you, once those are all done, add an example to the advanced section in the docs?

[someone1]

Sure I don't mind adding an example - do you just want a basic example of how to bootstrap hydra outside of hydra?

[aeneasr]

Yeah, basic example would be perfect!

[someone1]

closed by #1023