server : revamp chat UI with vuejs and daisyui (#10175)

server : revamp chat UI with vuejs and daisyui (#10175)

* server : simple chat UI with vuejs and daisyui

* move old files to legacy folder

* embed deps into binary

* basic markdown support

* add conversation history, save to localStorage

* fix bg-base classes

* save theme preferences

* fix tests

* regenerate, edit, copy buttons

* small fixes

* docs: how to use legacy ui

* better error handling

* make CORS preflight more explicit

* add GET method for CORS

* fix tests

* clean up a bit

* better auto scroll

* small fixes

* use collapse-arrow

* fix closeAndSaveConfigDialog

* small fix

* remove console.log

* fix style for <pre> element

* lighter bubble color (less distract when reading)