global: update GHA status badge, set GHA pio target to v2

.github/workflows/firmware_main.yml

@@ -23,4 +23,4 @@ jobs:
 
       - name: Build PlatformIO Project
         working-directory: ./firmware/main
-        run: pio run
+        run: pio run -e v2

README.md

@@ -1,6 +1,6 @@
 # Лілка
 
-[![Documentation Status](https://readthedocs.org/projects/lilka/badge/?version=latest)](https://lilka.readthedocs.io/uk/latest/?badge=latest) [![PlatformIO Registry](https://badges.registry.platformio.org/packages/and3rson/library/Lilka.svg)](https://registry.platformio.org/libraries/and3rson/Lilka) [![CI](https://github.com/and3rson/lilka/actions/workflows/pio.yml/badge.svg)](https://github.com/and3rson/lilka/actions/workflows/pio.yml)
+[![Documentation Status](https://readthedocs.org/projects/lilka/badge/?version=latest)](https://lilka.readthedocs.io/uk/latest/?badge=latest) [![PlatformIO Registry](https://badges.registry.platformio.org/packages/and3rson/library/Lilka.svg)](https://registry.platformio.org/libraries/and3rson/Lilka) [![firmware/main](https://github.com/and3rson/lilka/actions/workflows/firmware_main.yml/badge.svg)](https://github.com/and3rson/lilka/actions/workflows/firmware_main.yml)
 
 DIY-консоль, яку можна зібрати з дешевих готових модулів.
 

docs/library/index.rst

@@ -1,5 +1,5 @@
-Бібліотека "Лілка"
-==================
+Бібліотека lilka
+================
 
 .. toctree::
     :maxdepth: 1