wiki: correct TX pairing gesture and setup AP, add buyer setup track
The pairing instructions contradicted the firmware in ways that make setup
fail. The BOOT button is only read during the 10s window that opens on reset
or power-on, which we never mentioned, so the steps couldn't work on an
already-running transmitter. Pairing fires on RELEASE between 2-5s; holding
past 5s auto-triggers Wi-Fi update mode and past 15s wipes NVS, both
previously undocumented. And we described pairing as "LED pulses cyan" when
cyan is the update-mode colour — pairing blinks blue, then green.
The setup AP was wrong too: it broadcasts as TankSync-XXXX, not
TankSync-Setup-XXXX, and it's an open network. We told people to find a
password on the OLED that was never printed there because it doesn't exist.
Also corrected First Boot, which claimed an unpaired transmitter pulses cyan
every 5s and stays awake. It doesn't - an unpaired unit runs the normal sleep
cycle and gives no such signal.
New pages for people who bought an assembled kit rather than building one.
The wiki only ever documented the DIY path, and Home sent buyers to the shop
page, which is a sales page, not instructions:
Setup - Start Here, Install the Transmitter, Tank Calibration,
Pairing a Transmitter, Connect to Cloud, App Overview, App Settings,
Updating Firmware
Sidebar regrouped into "I bought a kit" / "Daily use" / "Build it yourself" /
"Reference" so the two audiences stop colliding.