[docs] Refactor & update API documentation

docs/dev/libs-3rd-party.md

@@ -0,0 +1,37 @@
+# Libraries
+
+A page outlining 3-rd some party libraries compatible with LibreTuya.
+
+!!! note
+	To use some (most? (all?)) of these, a flag in `platformio.ini` is required to disable compatibility checks (because most libs are meant for ESP32/Arduino official framework):
+	```ini
+	[env:my_board]
+	lib_compat_mode = off
+	```
+
+## [256dpi/MQTT](https://registry.platformio.org/libraries/256dpi/MQTT)
+Tested with `realtek-ambz`.
+```ini
+lib_deps = 256dpi/MQTT@^2.5.0
+```
+
+## [bbx10/DNSServer](https://registry.platformio.org/libraries/bbx10/DNSServer)
+Tested with `beken-72xx`.
+```ini
+lib_deps = bbx10/DNSServer@^1.1.0
+```
+This is the same library as in ESP32 Arduino Core.
+
+## [esphome/AsyncTCP-esphome](https://registry.platformio.org/libraries/esphome/AsyncTCP-esphome)
+Tested with `beken-72xx` and `realtek-ambz`.
+```ini
+lib_deps = esphome/AsyncTCP-esphome@^2.0.0
+```
+This is ESPHome's fork of the original library.
+
+## [esphome/ESPAsyncWebServer-esphome](https://registry.platformio.org/libraries/esphome/ESPAsyncWebServer-esphome)
+Tested with `beken-72xx` and `realtek-ambz`.
+```ini
+lib_deps = esphome/ESPAsyncWebServer-esphome@^3.0.0
+```
+This is ESPHome's fork of the original library.