Update config docs w/ new v1.70 config options

[jasikpark]

See https://github.com/slackhq/nebula/releases/tag/v1.7.0 for list

• firewall.local_cidr
• unsafe_route.install
• tun.use_system_route_table
• punchy.respond_delay
• lighthouse.calculated_remotes
• firewall.outbound_action: drop
• firewall.inbound_action: drop
• DNS names allowed in static_host_map (aka they will be refreshed now)
  • Future DNS Documentation options #77
• listen.host can contain a hostname
• Document lighthouse.advertise_addrs #46
• Explore documenting undocumented config options #49

Tasks

Beta Give feedback

1. firewall.local_cidr
2. unsafe_route.install
3. tun.use_system_route_table
4. punch.respond_delay
5. lighthouse.calculated_remotes
6. firewall.outbound_action: drop
7. firewall.outbound_action: drop
8. DNS names allowed in static_host_map (aka they will be refreshed now)
9. listen.host can contain a hostname
10. Document lighthouse.advertise_addrs #46
    +0
11. Explore documenting undocumented config options #49
    +0