Build docs and config fixes

docs/build.md

@@ -14,4 +14,21 @@ confirmed working commit. Building from the master branch is somewhat risky, and
 building from development branches is straight up stupid if you're not a developer.
 
 After cloning and checking out, check the documentation for module dependencies
-and the required version of python.
+and the required version of python in the `docs/dependencies.md` file.
+
+## Installing Python
+This step depends a lot on the platform you're using. TeraHz was developed with
+Raspberry Pi and Raspbian in mind. If you're familiar with Raspbian enough,
+you'll know that the latest version of Python available is `3.5`, which is too
+obsolete to run TeraHz and the required modules consistently.
+
+After messing with Debian arm64 packages in the early development days I determined
+that the most reliable way of getting Python on Raspbian is compiling it from source.
+This part of the installation will take the largest portion of time, as compiling
+anything complex on the Raspberry is painfully slow.
+
+If you're running an OS that provides a recent version of Python, great! You won't
+have to waste so much time waiting for the build process to finish.
+
+The Python version TeraHz works best on is `3.6.8`. To install it, download the
+gzipped tarball from the official Python website, and decompress it.

etcs/hostapd/hostapd.conf

@@ -6,4 +6,4 @@ wpa_key_mgmt=WPA-PSK
 wpa_pairwise=TKIP
 rsn_pairwise=CCMP
 ssid=TeraHz
-wpa_passphrase=teraherc
+wpa_passphrase=terahertz