[Trivial] Add config examples, + a link to RFC (#715)

bpf/dns_tracker.h

examples/direct-flp/README.md

examples/direct-flp/simple-stdout.json

examples/filters/README.md

examples/filters/single-ip.json

pkg/ebpf/bpf_arm64_bpfel.o

pkg/ebpf/bpf_powerpc_bpfel.o

pkg/ebpf/bpf_s390_bpfeb.o

pkg/ebpf/bpf_x86_bpfel.o