Remove dev API docs from repository (home-assistant#102274)

Author: frenck

.gitignore

@@ -111,9 +111,6 @@ virtualization/vagrant/config
 !.vscode/tasks.json
 .env
 
-# Built docs
-docs/build
-
 # Windows Explorer
 desktop.ini
 /home-assistant.pyproj

.prettierignore

@@ -1,7 +1,6 @@
 *.md
 .strict-typing
 azure-*.yml
-docs/source/_templates/*
 homeassistant/components/*/translations/*.json
 homeassistant/generated/*
 tests/components/lidarr/fixtures/initialize.js