Add distinction between DNS Aliases for Direct Mode vs NAT Mode to
describe the feature in ar71xx PR#573.
Include small format changes for firmware install steps.
Include note for tunneling using nodes with built-in switches.
Minor formatting tweaks.
Minor formatting changes on Installing Firmware.
Minor formatting changes to four sections, making formats consistent
across sections.
Format Install Firmware section consistently.
More formatting consistency checks in additional doc sections.
* Doc fixes and restructuring
This commit includes several misc changes to doc set. Create appendix
directory and add freq section with website images. Expand how-to
contribute section. Add reference to new 29 Host LAN mode. Add SNR sound
control to SNR graphs section. Add Radio Mobile Settings to How-To
section. Update images in Freq Spectrum section, and minimize reference
to "unshared" channels. Move Server Sync section to Services Overview.
* Fix misleading keyword search wording
Fix the misleading wording about doing a keyword search for AREDN.
* Fix total bandwidth allocation wording
Fix total bandwidth allocation wording in Radio Spectrum section.
* Clarify channel width at band edges
Clarify the warning against using wide channels that could transmit
outside of allowed FCC allocations.
* Heading change in services overview
* Add balancing comment about reducing channel width
Add a balancing comment that reducing channel width to increase SNR also
cuts throughput in half.
* Add SNR warning comment
* Fix reference to OpenWRT in screenshot
Replace reference to OpenWRT in screenshot with the AREDN login banner.