Feat/new UI (#13)

* new custom theme

* improve css: scrollbar, header, tabs and buttons

* update settings tab

* open file index selector by default

* update chat control panel

* update chat panel

* update file index page

* cap gradio<=4.22.0

* rename admin page

* adjust UI

* update flowsettings

* auto start in browser

* change colour for edit LLM page's button

libs/ktem/launch.py

@@ -2,4 +2,4 @@ from ktem.main import App
 
 app = App()
 demo = app.make()
-demo.queue().launch(favicon_path=app._favicon)
+demo.queue().launch(favicon_path=app._favicon, inbrowser=True)