Add download link for WifiAnalyzer_Alias.txt

The user can now download an alias file for the Wifi Analyzer app [1]
using a link below the node list.

The alias file maps MACs to readable node names, which makes debugging
easier.

Save the downloaded file to the root level of your phone's SD card, then
use "Settings > Manage aliases > Import" in Wifi Analyzer to load it.

[1] https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer