upgrade yarn to pnpm because why not

.gitignore

@@ -28,14 +28,10 @@ stats.html
 *.sln
 *.sw?
 .pnp.*
-*/.yarn/cache/*
-*/.yarn/install-state.gz
 analyse.html
 interface/vite.config.ts.timestamp*
 *.local
 src/ESP32React/WWWData.h
-.yarn/*
-.yarnrc.yml
 
 # i18n generated files
 interface/src/i18n/i18n-react.tsx
@@ -76,4 +72,3 @@ CMakeLists.txt
 logs/*
 sdkconfig.*
 sdkconfig_tasmota_esp32
-yarn.lock