Add support for navigating between packages

[kgryte]

Currently, one is unable to navigate between packages. We can base navigation on the current API docs side panel and likely reuse all the same logic.

Reusing the side panel in the API docs may require migration to an SPA and thus deployment via some other means than GitHub pages.

[gurramkarthiknetha]

assign this issue to me i will fix this issue

[kgryte]

@gurramkarthiknetha We don't assign issues, but you are welcome to submit a PR. Although, you are encouraged to first discuss your plans here before going too far down an undesired path.