Ingress Migration: Add More Migration Examples

[danehans]

The current migration guide (Envoy-based) provides a few simple migration examples. Expand the number of examples into a separate list of examples referenced by the _index.md of the migration guide.

cc: @artberger

[Tusharjamdade]

Hi @npolshakova and @artberger,

Should I proceed with adding more examples as suggested by @danehans?
If yes, could you please point me to any existing examples that I can refer to for a better understanding of the expected approach and structure?

[artberger]

@danehans, @Ashutoshx7 added the following example section to the ingress migration docs. Does this address this issue, or are there more examples we want?

https://kgateway.dev/docs/envoy/latest/migrate/examples/