Make Wifibox more intuitive to install

[pgj]

Recently Wifibox received some criticism about the shipped sample configuration files and documentation:

• https://jrgsystems.com/posts/2022-04-20-802.11ac-on-freebsd-with-wifibox/ "I was a bit confused at first when configuring wifibox after installing the pkg. The man page (man wifibox) specifies modifying the *.conf.sample files in the /usr/local/etc/wifibox/ directory to configure it but does not specify which settings are necessary for software to start."
• https://twitter.com/hashtag/wifibox "Well💩 For whatever reason default route was not added (#wifibox); needed to add one self. Before that, also had started wpa_supplicant in the VM, which did not complain about an instance already running. So starting|configuration of #wifibox is still damn fiddly😫"

Find ways to make it easier to use.

[pgj]

Created 17d81a5 to improve the comments in the sample configuration files. In addition to this, added a pkg-message for the net/wifibox port in pgj/freebsd-wifibox-port@35773e1 .

[pgj]

Hopefully, pgj/freebsd-wifibox-port@6c3d029 will also simplify the configuration.

[pgj]

All these changes are made part of main and backported for the 0.8 version.