.gitignore: Add some more entries (#179)

* Ignore .idea for JetBrain's IDE's
* Ignore most .vscode files
* Remove .vscode/mcp.json as local development settings

Author: reedy

.gitignore

@@ -1,3 +1,6 @@
+.idea/*
+.vscode/*
+!.vscode/settings.json
 *.pyc
 Reference/**
 custom_components/sigen/homeassistant/**