* [docs] Made Advanced its own section
This splits the Advanced page off from the Getting Started guide and
makes it its own thing. It now has some additional sub-sections for
bigger topics like caching and enhanced security. This also moves
tracing from Getting Started to Advanced as that feels like a more
appropriate location for it.
The enhanced security looks a little silly with a single section, but I
have guides pending for firewall configurations and I'd also like to
consolidate our how to provision TLS certificates in there as we repeat
this information multiple times.
* [docs] Fix all my spelling errors
* [docs] Inline the links in sandboxing
