Switch to Python 3.9

above --> below

Update WelcomeTab

Update install.md

Update qredisclient

Improve UX for TreeView

* Show only last part for namespaced keys
* Show namespaces first
* Remove ignored option from Global Settings
* Fix namespace rendering with multichar ns separators

Fix RedisInsight#4962

Add dark mode for Windows 10

Fix issues with connection id's

Update qredisclient

Fix RedisInsight#4920

Fix RedisInsight#4868