docs: drop ar71xx targets from supported devices

docs/user/supported_devices.rst

 Supported Devices & Architectures
 =================================
 
-ar71xx-generic
---------------
-
-* 8devices
-
-  - Carambola 2
-
-* ALFA Network
-
-  - AP121 [#deprecated]_  [#device-class-tiny]_
-  - AP121F
-  - AP121U [#deprecated]_  [#device-class-tiny]_
-
-* Allnet
-
-  - ALL0315N
-
-* AVM
-
-  - Fritz!Box 4020 [#avmflash]_
-  - Fritz!WLAN Repeater 300E [#avmflash]_
-  - Fritz!WLAN Repeater 450E [#avmflash]_
-
-* Buffalo
-
-  - WZR-HP-AG300H / WZR-600DHP
-  - WZR-HP-G300NH
-  - WZR-HP-G300NH2
-  - WZR-HP-G450H
-
-* D-Link
-
-  - DAP-1330 (A1)
-  - DIR-505 (A1, A2)
-  - DIR-825 (B1)
-
-* GL.iNet
-
-  - 6408A
-  - 6416A
-  - GL-AR150
-  - GL-AR300M
-  - GL-AR750
-  - GL-USB150 (Microuter)
-
-* Linksys
-
-  - WRT160NL  [#device-class-tiny]_
-
-* Netgear
-
-  - WNDR3700 (v1, v2)
-  - WNDR3800
-  - WNDRMAC (v2)
-
-* OCEDO
-
-  - Koala
-
-* OpenMesh
-
-  - A40
-  - A60
-  - MR600 (v1, v2)
-  - MR900 (v1, v2)
-  - MR1750 (v1, v2)
-  - OM2P (v1, v2, v4)
-  - OM2P-HS (v1, v2, v3, v4)
-  - OM2P-LC
-  - OM5P
-  - OM5P-AN
-  - OM5P-AC (v1, v2)
-
-* TP-Link
-
-  - Archer C5 (v1)
-  - Archer C59 (v1)
-  - Archer C7 (v2, v4, v5)
-  - CPE210 (v1.0, v1.1, v2.0, v3.0)
-  - CPE220 (v1.1)
-  - CPE510 (v1.0, v1.1)
-  - CPE520 (v1.1)
-  - RE450 (v1)  [#device-class-tiny]_
-  - TD-W8970 (v1) [#lan_as_wan]_
-  - TL-WDR3500 (v1)
-  - TL-WDR3600 (v1)
-  - TL-WDR4300 (v1)
-  - TL-WR710N (v1, v2.1)
-  - TL-WR810N (v1)
-  - TL-WR842N/ND (v1, v2, v3)
-  - TL-WR1043N/ND (v1, v2, v3, v4, v5)
-  - TL-WR2543N/ND (v1)
-  - WBS210 (v1.20)
-  - WBS510 (v1.20)
-
-* Ubiquiti
-
-  - Air Gateway  [#device-class-tiny]_
-  - Air Gateway LR  [#device-class-tiny]_
-  - Air Gateway PRO  [#device-class-tiny]_
-  - Air Router  [#device-class-tiny]_
-  - Bullet M2/M5  [#device-class-tiny]_
-  - Loco M2/M5  [#device-class-tiny]_
-  - Loco M2/M5 XW
-  - Nanostation M2/M5  [#device-class-tiny]_
-  - Nanostation M2/M5 XW
-  - Picostation M2  [#device-class-tiny]_
-  - Rocket M2
-  - Rocket M2 Ti
-  - Rocket M2 XW
-  - UniFi AC Mesh
-  - UniFi AC Mesh Pro
-  - UniFi AP
-  - UniFi AP AC Lite
-  - UniFi AP AC LR
-  - UniFi AP AC Pro
-  - UniFi AP LR
-  - UniFi AP Pro
-  - UniFi AP Outdoor
-  - UniFi AP Outdoor+
-
-* Western Digital
-
-  - My Net N600
-  - My Net N750
-
-* ZyXEL
-
-  - NBG6616
-
-ar71xx-nand
------------
-
-* Aerohive
-
-  - HiveAP 121
-
-* Netgear
-
-  - WNDR3700 (v4)
-  - WNDR4300 (v1)
-
-* ZyXEL
-
-  - NBG6716
-
-ar71xx-tiny [#deprecated]_ [#device-class-tiny]_
-------------------------------------------------
-
-* D-Link
-
-  - DIR-615 (C1)
-
-* TP-Link
-
-  - TL-MR13U (v1)
-  - TL-MR3020 (v1)
-  - TL-MR3040 (v1, v2)
-  - TL-MR3220 (v1, v2)
-  - TL-MR3420 (v1, v2)
-  - TL-WA701N/ND (v1, v2)
-  - TL-WA730RE (v1)
-  - TL-WA750RE (v1)
-  - TL-WA801N/ND (v1, v2, v3)
-  - TL-WA830RE (v1, v2)
-  - TL-WA850RE (v1)
-  - TL-WA860RE (v1)
-  - TL-WA901N/ND (v1, v2, v3, v4, v5)
-  - TL-WA7210N (v2)
-  - TL-WA7510N (v1)
-  - TL-WR703N (v1)
-  - TL-WR710N (v2)
-  - TL-WR740N (v1, v3, v4, v5)
-  - TL-WR741N/ND (v1, v2, v4, v5)
-  - TL-WR743N/ND (v1, v2)
-  - TL-WR840N (v2)
-  - TL-WR841N/ND (v3, v5, v7, v8, v9, v10, v11, v12)
-  - TL-WR843N/ND (v1)
-  - TL-WR940N (v1, v2, v3, v4, v5, v6)
-  - TL-WR941ND (v2, v3, v4, v5, v6)
-
 ath79-generic
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